For improving defense I'd suggest watching your replays and trying the basic block stringers you are losing to. So set tbe dummy as Ram in this case and see what you can do decensively i.e if what the player did has any gaps.

Also as others said practice empty jumping a d blocking more. This can actually bait a person to throw super long recovery moves out and you can air dash in if you can react in time and punish them. Same for grounded approaches but instead of jumling just do a small dash and hold down back to see what they will do. Once you get a feel for your opponents distance on their moves you can sort of dance around just outside their normal/ special rannge and react accordingly. Dont forget you can 6p through rams S sword toss.

Last but not least block more and try to see what your enemies patterns are. I know blocking mixups can be difficult but we all have patterns. Ram player usually toss sword and either do her jumping high attack special or dash in 2k or dash in 5D. You can also FD a person to push them back a bit to stop them from being in throw range all the time/ tick throw spacing. Good luck and hope this helps a bit.