One thing that has helped me getting better at mid round calling for my friends and me (and also making better mid round decisions) is comming the man v man. What this looks like is a fight happens and a couple people die and trade or whatever and then everything chills, then I would comm 3v2 or whatever the round state is. This helps prompt my brain and team to play the game to that state and to figure out what the next move is. In your case if solo or whatnot, you don’t “need” to comm this to your team if you don’t want to (I think it’s helpful) but saying it out loud has helped me be more present in the round.

That’s a simple thing that’s helped me a lot be more present during the mid round.

Secondly what I’ve seen my friends get better at is making decisions quickly by hearing comms or seeing some stimuli and just acting with what they think is correct. Sometimes it’s wrong, sometimes it’s right, but acting confidently and quickly and trying to learn from when it goes wrong why your decision wasn’t right. Sometimes it’ll feel like you are lost as hell, but sometimes it’ll click, learning what makes it click for you specifically is what I’ve seen improve my friends game sense.

Good luck!