I'm not good at writing wall of text but general, work on your zoning and your stein usage..you don't use her drive enough. Also work on your combos, as you don't seem to be using optimal stuff. I also saw you place two steins on on top of each other and use totsuka with that, which is a bit useless cause the laser flies to the steins and actually just stays there for a bit before homing in on the opponent.
Learn optimal placment for Totsuka. 5D > 6D > totsuka (> 66D > 4D if you want to keep it going) is a really basic "barrage" that you can start off with after a knock down. That setup lets you run in for some free pressure.
You're bursting really early too, which can sometimes be okay for Mu if you wanna maintain momentum early on. Don't get predictable about it. I was shocked that the burst you did after Noel silencer (around 3:12 in the second vid I think) went unpunished.
tldr; learn how to effectively place steins, work on combos, work on zoning...play a bit safer..
Okay I'm quite bad at this, I'm sure someone else can do better than me.