fixing stripped screw in soft-wood door frame?
Remove the plate and drill out the hole and fill it with glue and a dowel.  I've used a 3/8" oak dowel in the past for this. Use a good wood glue and after it dries, shave it down with a wood chisel.  Use touch-up paint if needed.

Make sure you allow the glue to dry as directions say and pre-drill into the dowel.  The screw should fit tight then.