Idk. If I was her, the only shot I would've changed was the forehand. i prefer this forehand actually than the one was she was winning a lot. the current backhand has little use of the legs, is completely open-stance, has little topspin, is jerky and not very fluid, and is too much just arm and wrist. The old backhand used more legs, was hit with more topsin, switched between open and closed stance depending on the shot, was fluid and more simple, and utilized her whole body unlike the one now-a-days.
on to the serve. I don't like this serve because it has even more moving parts than the previous serve. The ball toss is too inconsistent, the speed is down, the feet stay too parallel to the baseline, she doesn't end up in the court after the serve (her body momentum seems to stay where she made contact), the arm and legs are not in coordination, and the second serve is all arm now. There is little variety on the serve now and she can't hit the serve as accurately or as hard as once hit. Opponents can read her serve from the toss now and before they couldn't. Even when Venus hits good serves, the opponents already know where it is going based off the toss.
Not to mention, Venus seems to be pl;aying with even bigger racquets since 2004. Racquets like that allow players to be lazy and use less of their body to hit shots prorperly. Believe me, it happened to be. Venus needs to go back to something 100 sq inches to 105 square inches. Everything except the forehand needs to be like it was from 1999-2004. It is the only way Venus will ever regain her previous form from 2000-2003.