Nice backhand, stay off the rear heels on your forehands. Fores, try to stay balanced and solid, not hopping and moving back.
Possibly you use lots of loopy moon balls on the forehands, something good to allow you to run and retrieve, but not necessarily win points against better players.
I think it's time for you to get serious and decide whether you want to put out the energy and time to get past that 4.0 obstacle. If you do, you need lots of disipline, balance, controlled swinging, and energy/concentration.
Of course, you need partners who can hit back 20 balls, who can run most of your shots down, and actually hit with depth PLUS pace and spin.
I suspect your shots take lots of your energy, shortening your concentration after a few hours of practice the 7th day in a row. Too much energy expended in a simple forehand is not something any top player likes to do.