@mcpeanuts also said something that made me really think. "Josh throws his characters to the wolves". I know my assist calls are bad but I'm unsure how I'm supposed to call my assist well not bad?
I can point out some specific examples if you want. Here's your set with Deer:
The assist calls game 1 are fine at the start (better than Deer's actually, in fact he was feeding you Bella and you could have beat up on her more than you did if you wanted to), but then at 0:42 you call M Shadow with your back to the corner and both characters get hit. Now I know your assist macros were wrong for this game and this was supposed to be Updo but whatever. This is still a risky call. Deer is doing a left/right mixup to you, and both characters could die if you block + call assist but you're blocking the wrong way. Which is what happens but Deer doesn't snap so you get to keep Fukua for a little while.
1:22 is another questionable one. If you're going to call Updo while under pressure like this you should block low. If you block low the worst that could happen is Double could grab you (which means she doesn't get a happy birthday) or she could do TK Barrel or something (which you should be able to react to). If Double had just dash up c.LK here that would have been the game.
Game 2 @ 3:03 you mess up your air grab reset (happens, not worth getting stressed out over) then you land and call Fukua. Why? This call isn't doing anything for you. Moreover with this assist you either want to call it while your opponent is in blockstun or when you have some distance between you and your opponent. You call her at a time where you have no clear advantage, and the worst case scenario happens and both characters get hit.
@ 3:38 you downback and call Fukua, was this supposed to be Updo and you got mixed up as to which assist was which?
@ 4:04 you air grab and call Filia at the same time... it works out but again it's super risky. This wasn't a reset or anything, this is just you chasing his tech. As a reset calling an assist when you air grab is ok because it can force them to block if they tech the grab. Here though you're just chasing Deer's ground tech, you don't even know for sure if he'll be in the air. Maybe it was a read and you were very confident he would jump... but if you're so confident why are you calling Updo to cover yourself if he techs the air grab?? Why did you do this???
@ 4:08, about half Filia's life is red health but if you go back and rewatch she hasn't recovered a single pixel of it in the last 9 Skullseconds because you keep calling her the instant the assist is available. If you had stopped calling her she could have recovered up to around 70% of her total health but instead she dies as an assist to this PBGC.
In general it seems like you feel like you need to be calling an assist all the time. Try to get out of that mindset. Call your assists when you have specific goals you want to achieve using them. Call M Shadow from an appropriate range in order to help in neutral, don't call it when you're getting hit or they're right next to you, or both. Learn how to play defense without calling Updo; that assist is a good tool but not if you use it 100% of the time when someone is in your face, that makes you predictable.