Is there a way to change spells in character?

[Ridiculon]

I'd like to change the Alter River spell to affect any current so that i can use it in the ocean.

[Volkard Abendroth]

Spell research and an open-minded DM.

[Shadowborn]

Yes, I'd speak to your GM about allowing your character to research a variant of the spell, as per the spell research rules.

[Ridiculon]

I've also made a thing here detailing what i'd really like