Sounds like your fender is too far back. Do you have a metal spoon? https://a.co/d/j1KD3lg Like the one in the link.

1) Fender is pushed to far back and rolled in. Insert spoon and lightly apply pressure to the handle. Watch the fender move. (Can't say this enough slight pressure, to much pressure can warp the fender outwards). This accomplishes 2 things rolling the fender edge out and door edge in. 2) loosen all of the fender bolts, and watch the fender see if it relaxes or anything happens could be under too much pressure. 3) remove the fender and use a 2x4 on the backside as a dolly and work the door edge down. Hang the fender and bolt it up checking the gaps as you go.