as long as datastores are working for you, then I don’t recommend losing players data to switch to a new thing that also uses datastores but does some other things.
First off ProfileService uses Roblox Datastores. I assume your question is how to I regular data into profiles that ProfileService uses.
Secondly, I always recommend using ProfileService unlike @PorchThatHuantsMe . ProfileService is the most overpowered way of safely handling player data.
Thirdly, what you can do to migrate to ProfileService is:
Learn ProfileService
Create a migrator script when a player joins that checks if they have old data. If they do, simply move that data into the new Profile you created for them.