Baby still won’t eat solids

I hope everyone is doing well! But my son just turned eight months and we have been struggling for months now with him trying to eat anything solid! He still eating a lot of formula and he’s gaining weight but I’m starting to get nervous I was wondering if anyone had any tips or what I should be feeding him we have tried all of the Gerber baby purées he hates every single one of them the only thing he would eat a few scoops of is oatmeal