What to do with picky eaters:
Here are a few tips my wife and I have used that have allowed us to avoid picky eating so far
1. Bring kids in on dinner prep, let them help cook, they feel invested in the outcome
2. Make it 'not a big deal', don't freak out if they don't want to eat something, make it not a big deal, try again the next day calmly
3. Try TINY portions, I'm talking like 3 peas, half a stem of broccoli...kids can be intimidated by huge portions
4. Set the example, eat the foods you want your kids to eat, talk about how much YOU love these foods (don't tell the kids THEY need to love them, big difference)
5. Make meal time consistent and make the routine the same day by day
6. Stop saying 'no' so often to "bad" foods, again don't make things a big deal and your kids won't see it as a big deal either
7. Stop using food as a reward or a punishment (no more "you're not getting up til you finish your broccoli")
8. Gamify it...kids respond to your energy. If there's a food you want them to try, 10x your energy and pretend to be a gameshow host, be goofy, do taste tests, make them laugh and they'll be more willing to try new foods
Those are off the top of my head, hopefully it's helpful
Basically stop taking it so seriously, be fun/high energy, model the foods you want them to eat, and don't make big deals out of them NOT trying things