Here is how I would approach teaching Yoshi how to play with toys...It's important that you start-off showing him the very basics of what playing is, how to play, etc., and that's why I recommend buying a few of those cheap, plastic Budgie toys at Petco that have different moving parts and that make noise. Then remove ALL of the toys that are currently in his cage (they are doing no good and only overwhelming him), and each day you'll work with one or two of the plastic toys outside of his cage, and when you're done you'll hang those toys only inside of his cage, and the next day remove them and work with them outside of his cage, then hang them back up, etc., until he starts playing with them on his own. Then you add a new type of toy, working with one, single toy each day then hanging it in his cage when you're done, then the next day removing that same toy to work with him outside of the cage, then when you're done you put it back in his cage, etc., until he starts playing with each individual toy and you move on to a new one...One toy at a time, until he gets to the point where he knows how to play with any toy you give him automatically...
Assuming that Yoshi isn't afraid of toys and he just pay any attention to them, then you need to show Yoshi how to play with his toys! It's no big mystery, birds are like human children in that they learn by watching someone else do something and then they copy what they are doing, so you need to show Yoshi how he is supposed to play with each different type of toy he has, and then encourage him to do the same. He will learn to play with his toys by watching you play with them. It really is that simple. Now I don't know what types of toys you have for Yoshi, but there are different types of bird toys, each one with a different purpose: Some toys are made of thick paper/cardboard and are meant to be shredded apart, some toys are made of different pieces of wood and are meant to be chewed on and broken apart, some toys are made of plastic and are meant to be poked-at or "beaked" back and forth, with some of them having parts that are meant to be "beaked" in order for then to make noise, such as toys with bells, etc. So you should show Yoshi what each different type of toy is meant for...The best toys to start out showing Yoshi how to play with are ones that make noise, like the very simple plastic toys that have bells on them (usually these toys are meant for Budgies/Parakeets and are very inexpensive to buy in the pet shops; Petco and PetSmart both have a large selection of these cheap, plastic toys that have bells,
parts that spin around, parts that swing back and forth, etc.)...Then I would remove all of the toys that are currently inside of Yoshi's cage or attached to his play-stands/the top of his cage, wherever he has toys attached, because he doesn't know how to play with them, and you need to start with very basic toys that will get his attention with bells, parts that spin around, parts that swing, etc. And those are the only toys you're going to want to have inside of his cage to start off with, building on each type of toy as he learns how to play with him. If you leave all of the toys that are inside of his cage right now he's only going to keep ignoring them and probably be overwhelmed by them because he doesn't even know why they are there or what they are for. So even if it doesn't feel right to remove all of the toys from Yoshi's cage all at once and replace them with a couple cheap, plastic toys that you are showing him how to play with each day, you have to understand that Yoshi has no idea what all those other nice, big toys are for, and he needs to start with the very basics and build-up to the nice, big, expensive toys. He's not doing anything with them anyway, and he needs to not be overwhelmed by them and be able to concentrate on only the toys you're teaching him one at a time. Once Yoshi learns the very basics of how to play with toys in-general, eventually you'll be able to put any type of toy in his cage and he'll play with them; but for right now, remove everything that is in there and start-off with 2 or 3 basic, plastic toys that are the same toys you will be working with him on each day.
***These are the types of toys that I always tell people to start out with, because they either make noises or they have parts that spin around or swing back and forth, and they easily get the attention of the bird. So I would go to Petco or PetSmart and buy a few of those cheap, plastic Budgie toys, choosing one that has a bell on it, one that spins around, one that swings back and forth, etc. They only cost a couple dollars each, and they will be very easy to show Yoshi to play with. Then I'd set aside some time each day where you will just work with Yoshi one-on-one, and where you will actually show him how to "beak" the bell to make it ring (you'll obviously use your finger, not your beak, lol)...And then show him how to use his beak to make another toy spin around. Then show him how to "beak" the ball to swing back and forth, etc. If you work with Yoshi with these simple toys for a little while each day, and after you work with him and show him how to play with a particular toy or toys, THEN you hand those particular toys up inside of his cage. And then the next day take them back out of his cage and again work with him one-on-one outside of his cage with those toys again for a while, and then again hang them back up inside his cage...And do this until you see Yoshi playing with the simple, plastic toys. Once he is regularly playing with the plastic toys, THEN you can start showing him another type of toy, like a wooden block toy he is meant to chew on. Work with him on playing with that toy, then hang it up inside of his cage, and so on and until he's regularly playing with/chewing on that toy...And just keep doing this with each new type of toy you have. But it's extremely important that you start out slowly and use the very basic toys that make noise, spin, swing, etc. so that you get his attention and he learns the very basics of playing...