You have value
Probably more than you think. And people have to see value on what you are doing. One of the ways is not saying yes to everything, it sounds suspicious. You are good at something, while you cannot do others things. Don’t pretend to be doing everything. Your value is then diluted. If you are struggling, it’s sometimes hard to say no, but the long term goal shall not be lost. If it helps you in terms of money, learning, or network, don’t hesitate, but please be brave and say no when you are asked for things you would prefer not to be doing. Or people you don’t like ask you to build something. Life is short.