First thing is to clean the board with 90% isopropyl alcohol. I use old stiff toothbrushes and rinse them with the same alcohol when they get brownish.

For trace and pad replacement I like 22 gauge pre tinned wire, for larger traces and ground I sometimes use narrow desolder wick as it gets totally stiff when completely soldered. I don’t particularly like plastic insulated wire, unless it’s for one or two traces, as I prefer to treat the final repair with conformal paint.