What do you all see that could use some work?
It starts off with basic ground strokes and then works into serves and volleys.
On FH side:
The key thing I'd work with is overrotating. Compare with Thiem:
This exact your shot is an extereme pick, but in all other you still rotate through contact. Your arm should come forward at come point while torso rotation slows down when chest is more or less facing the target. Thiem video used:
On BH side:
I think it looks decent, however, video quality is not great to pick lots of details. Maybe sometimes too close to your body, as
@S&V-not_dead_yet mentioned?
Serve: tough one. You definitely have good explosiveness and whole body involvement, which is great, and you also manage to balance and direct it well.
1. I'd get rid of that front foot step. It gives you nothing good, and with your low toss it steals your time. For example, you have no time to push your hip inside the baseline, hence jumping up, not exploding forward.
Look at low toss servers: Groth, Dolgopolov, Kyrgios. No one actually steps with his front foot after ball toss. Some kind of pivot - posssible, but not a step. Another problem is the temptation to chase the toss when it gets erratic in a match, instead of skipping, focusing and retossing (and keeping as a rule to practice and polish ball toss).
2. As the backward jump mentioned, you then compensate with overbending in waist:
Work on exploding more "tilted" into the court, more onto the ball, rather than up behind the ball. Direct all your movemant upward into the ball, don't try to hit forward/down as you've jumped in the air. Racquet is redirected on the very top of the swing only, pivoting via all-arm internal rotation (ISR) and some wrist flexion, and it's inavoidable, shouldn't be forced, but timed.
So, to round up the serve part, I suggest some smooth practice with precise toss and smooth upward acceleration and upward swing. Maybe some cylinder drill:
Volleys: I'd say you could get the racquet head more above the ball, so you naturally get some downward path:
Especially on BH side, where you tend to slap with closing motion on so many of them. Racquet higher in preparation, strong wrist - and you get all the punch you need (BH OH being a separate story).