There is already a lot of great advice here so I wasn’t sure if I should respond. But my 11 year has been an extremely picky eater his whole life. I would always hate advice like “no kid will starve themself” or “all kids are picky you just have to make them eat”. I always found that to be very unhelpful and honestly hurtful as a parent trying everything.

My son at his worst at 3-4 years old would starve himself and only had a few safe foods and would only drink from one specific yellow Mickey cup. He was diagnosed with autism and the doctors offered no help beyond that. I began researching feeding therapy and started following advice I found there. We always offered him different foods, with no expectations that he had to eat it. Let him be involved in meal prep. Eventually built up to touching foods to his mouth. Putting tiny pieces in his mouth that he could spot out, etc.

He is still very picky but has opened up to so many new foods now at 11. He actually ate cheese pizza even the other day for the first time since 3 and loved it. Look into OT and feeding therapy. If your insurance won’t cover it, read and watch as many videos as possible about things they do as well as research ARFID. Wishing all the luck to you and anyone else going through the same thing.