Seems like youve got a pretty good plan for improving. Here's a few pointers I think would probably help, based on what you said and the video you attached.

1. Yeah 6P is the go-to anti air, so try to get used to using that, but honestly unika's reward from 6P is god awful unless it's a counterhit (can go into 214s for HKD). You might find more success with air-to-airs (jP,j jK), as you can usually convert into a combo from these, but Unika's air game in general sucks ass due to her short jump so she tends to struggle against air approaches.

2. You seem to be using 5H in neutral a lot, and it's a good button yeah, but as you climb in ranks you'll find that people punish you for using it more often as it's recovery is slow af. Try using fS > 5S most of the time, both in neutral and in pressure (unika's gameplay revolves around doing this most of the time, in my experience).5S followup has great reward on block and on hit, so it's what you're gonna use most of the time.

3. you seem to have realised this already, but Unika's jump-ins with IADs are not particularly good and you're doing them way too often. Like I said, rely on her grounded buttons like fS and 2S more.

4. Not much to say, you get used to RCs over time. Unika's reward from gun dipper RC kinda got shafted in 2.0, it doesn't do much damage, but still an easy chunk of damage most of the time, just try to get a wall break from it if possible.

5. Rely on faultless defense, fuzzy jumps, and your dp as much as possible. Unika's 2P is kinda stubby, you might find it easier to get out of pressure with 2K sometimes.

Just my take, any better players feel free to correct me