Combos, learn them!
JC > land dash 5C works
6C > 5C > JBCD > airdash blah blah blah
Kokushi musou 2C 2C 2C (2C) JBC land tsubame 6C 3C (Had the oppurtunity at around 5:00)
Chun doesn't need to be RC'd in corner.
Had the oppurtunity to do 5C CH iad JC 5B 5C blah blah blah at 2:24
And toonnnnnnns of other stuff.
As far as actual play you just kinda hop around, you aren't controlling Litchi's best area (in front of her and above her), instead you were playing into where Ragna controls space best. Blockstrings were weak and very repetative (though I realize there was some spots where you thought you got the hit and just didn't, that happens).
Itsuu in pressure (especially vs Ragna) should be used really sparingly, it really isn't that good.