Weaning by abundance, read up on it. The nsby will drop a feeding on its own, but you still offer it fir a few days to be sure that one feeding is really dropped, usually the morning and last feeding ate the last to be dropped. Burds actually feel more confident and willing to try foods with a full belly from hand feeding. Weaning is a very critical time that sets up the bird for life, and helps prevent behavior issues and plucking later in life. It's a time for added contact, guidance, and support feedings. Eclectus can take longer to wean, and for all parrots there is some thst jeep a small warm feeding before bedtime fir life.
Weaning is aldo a time that illness can spring up that were hidden due to the stress. So i agree with above 20% weigh loss us a trip to the avain vet specialist.
I've stashed a few Weaning articles in my ornithology thread, if you can't find good articles when you search let me know and I will link them . Thus us a very critical time in a birds life, you want to get it right. And tgey need a lot of extra attention, so tgey feel supported and confident. Parrots like primates have prolonged parental care.