GGs Iku. Will host some more in 1-2 hours, need a small break.
I'd say you need to get better at lining up those j.2a's, limiting certain combos (j.6c into j.6c does damage, but opponent gets to recover) and general defense. Defense would include staying out of range of reach melee attacks like Marisa's j.6a while dashing and at disadvantage, baiting into those severe and wide j.2a's, thinking about when to Border Escape out of pressure, things like these. Iku is a good character, but she's a little bit slow and hard to use.