iflight succex-e f7 capacitor broke off, my fc still turns on, the quad still arms, but now my quad flips on takeoff. it flew great before this. should I try to solder the capacitor back on? or can this be fixed in betaflight?

Please post a photo of where the capacitor has come off the board.

If the quad was flying perfectly fine before and only the missing capacitor has now made it flip over with not other damage, no changes made to you Betaflight configuration, and you are 100% sure (and have double-checked) that you have the clockwise props and the anti-clockwise props on the correct motors then the simple solution will be to re-solder that capacitor back on.