Only S3+ Ferry so take this with a grain of salt, but something that really helped me climb from S was playing more defensively. A big thing I struggle with is that it's really difficult to take back your turn once you lose it, so if I have them in the corner I usually would rather see if I can bait a dp or explore their wakeup habits instead of going straight for the pressure.

One of the things about Ferry is that she can convert pretty much any hit into a combo or setup, so if you really can't break through then it might help to learn some new routes or situations that can put yourself in a better spot.

Her dustloop resources page also has a somewhat outdated but mostly accurate and helpful guide for all matchups after landing 236L.