I was a massively fussy eater as a kid, and still am to a certain extent.
The only tip I’d give you is to try and avoid making it an issue.
I was really thin as a child, and barely ate anything. I just didn’t like food. The times where mealtimes turned into a battle of wills with my parents are burned into my memory and I still can’t eat some foods because of it.
When they eventually just said “sod it”, and stopped watching what I ate, I found it much easier. Being distracted at meal times by general conversation, but being made to sit at the table made me just kind of pick at food, and eventually made me realize it tasted OK, and the texture wasn’t to horrific.
For years after I only really ate because I was hungry, but over time, I’ve actually come to enjoy eating, and now struggle with being a bit of a porker!