First step: Block.
If you don’t want to block, then Drive-Counter or try to counter-attack in the holes, with 5A or 2A. Figuring out what hit’s overhead and what hits low will definitely help. In fact, that should of been the first thing you did when you got the game. You can just figure it out by going in to training mode. While you’re at it, also figure out what moves are punishable on block/instant-block.
It sounds like your new. Your probably just missing free punish opportunities and aren’t seeing the holes, or aren’t reading the fight well.
Against Ragna specificly, you just have to block. Ragna isn’t quite suited for rushdown, so eventually your blocking will pay off. He’ll either have to go for the throw, which if you break will reset the momentum back to neutral. Or back off a bit, which gives you a chance to reverse the momentum. The Ragna’s you really need to worry about are the ones that play the footsies game against you.
Against the run-of-the-mill D-spamming Noel’s, just block and punish. Against a a Noel with half a brain, she’s a bully. Don’t try to air-to-ground her, and don’t try to air-to-air her. Just stick to the ground and get your clutch on hard.
Extra tip against Ragna and Noel: your C buttons are off limits. Both can punish you on block or whiff. Well, on block you can cancel to 236A, but now you just spent 1 star to pass off momentum to them. It’s still better then straight up getting hit, but just not using the C button is better.
Against Jin, the fight feels like a good ol’ Street Fighter (NOT Street Fighter 4) fight. Just be the better player.
Don’t use 6A where it won’t hit.
632146C? It is what it is. If using 4 stars on the super would net you more damaging then something else, then use it. If not, then don’t. Throw>236A, 6C>632146C is the more damaging combo, btw.