Our house rule is 3 bites (no determined size of bites... Could be nibble, could be huge mouthfuls) before they can ask for something else. And i also try a variety of ways of preparing the veggies. My daughter doesn't like anything noodle related, whether spaghetti squash or zoodles but will eat her weight in brussel sprouts and brocolli (and the meaty spaghetti sauce) And she even takes my mushrooms (which I personally can't stand) and eats them happily. Sometimes she likes sweet potatoes, sometimes she doesn't, but i keep offering foods to her, whether or not I think she will like them. (Sometimes reverse psychology helps, but I'm not always a fan of tricking my kids to eat something).
My husband and I are both texture eaters. There are some things we won't touch because the texture is odd, but we also don't let that stop us from offering it to our kids. Keep offering them a variety of foods prepared different ways and they may surprise you with what they'll eat. And ask questions if they don't like something. Did it taste bad? Did it feel weird? Maybe if we add (insert flavor/seasoning here) it would taste better. Wanna try?
Some kids have to try things 40 times before they like it. Some kids like it immediately.