Earth + Water = Wood Style
Water + Wind = Ice Style
Fire + Water = Vapour Style
So either I can get The thing that Made Hashirama a literal Demi-God without Six Paths Chakra. But that’s 50/50 if I get Hashirama level Wood Style, or a level that makes Yamato look powerful with it. But since I am a human with the ability to make OC, I say, I the greater likelihood is Hashirama Level.
Or
I can get Ice Style and train it to the point to where it could match Crystal Style.
Or
I can get the Kekkei Genkai that allowed Naruto to overpower an attack from Kaguya.
Or
I can choose something like Lightning + Fire or Fire + Wind and do some real damage.
Some many choices