97 foreman 400 stuck in first gear

First time posting here.
So I was riding my 97 Honda foreman 400 the other day and got stuck. I tried going into reverse and couldn’t. It was stuck in first gear so I drove it home in first and got looking on the forums. I tried adjusting the clutch with the locking nut and screw on the crank case. That did nothing. I took the crank case off and nothing was broken or out of place so I sealed it up and put some new oil in. Still won’t shift. I tried to ground the green/red wire to bypass the neutral safety switch to try starting it in gear and it wouldn’t start. I don’t know what would cause the no shift problem, a bad clutch? Something in the trans? Any help would be appreciated.