This sounds like normal parrot behavior if your bird is not getting out enough, has too small of a cage, or has found that it gets attention for this behavior (it could be a combination of these factors) . You need to make sure your cage is large and that your bird is getting a few hours out of it each day. You also do not want to give your bird attention (eye contact, proximity, let-outs) when undesirable behavior is occurring.
Birds can also scream when sick or scared, so make sure you aren't placing "scary" toys into the cage without habituating your bird to them first. Toys can scare them if they aren't used to them (depends on the bird).
Also, making sure your bird is getting enough sleep nightly and avoiding allowing them access to shadowy spaces (like huts, boxes etc) can level off behaviors sometimes if there are hormones involved. Your bird is maturing and a baby is always quieter than an adult, but a hormonal adult will often be more inclined to vocalize for longer periods of time. They mature sexually between 1-3 and so you need to make sure they have at least 10-12 hours of sleep each night and reduce access to shadowy areas, as well as avoiding touching them on their backs etc (head and neck only).