I watched the first video and assume the OP was the guy in red. Had a hard time determining who was 3.5 and who was 4.0 in that video. They both looked very 3.5ish, i.e. lots of UE's, very little consistency and not much in the way of weaponry other than fitness.
I think there is good recovery footwork but poor setup footwork (lots of reaching). I think the strokes were often too delicate and deliberate and not loose and free swinging, leading to very few balls going deep. A lot of the rallies were played inside the baseline.
Too much arming. Too many DF's especially given the serve speed wasn't terribly fast.
Sometimes I think fear of losing inhibits people too much in their development. Throw that fear away and focus on the process of becoming a good tennis player. Hit out with power, even if you send some long. Think of the fundamentals - unit turn, knees bent, low to high, hit off the front foot, head still. Pick one to work on every day and focus on that fundamental. Don't worry about the outcome. As you improve, winning will happen as a byproduct of committing to the process of developing a good foundational game of tennis.