Originally Posted by TomT
The transition from 3.5 to 4.0, similar to the transition from 3.0 to 3.5, is basically just being able to hit a little harder, with slightly better placement, more consistently. If your stroke mechanics are basically ok, then it's just a matter of more court time, more practice, more matchplay. If not, then no strategy or tactics or anything else will make you competitive at higher levels, imho.
Post some videos if you have them.
most of the better 4.0s are consistent as heck and are just not going miss that many easy shots (not going to blow you away with power but good forehands, good short court play). the only exceptions i see is if its a younger guy who is just starting league tennis. they usually will be a bit more aggressive but will make more mistakes (i do better vs them).