Your gravity is 0.998 and it tastes sweet to you?
That's pretty much bone dry. I suppose you can try acclimating
and pitching another yeast, but if you do, EC-1118 or Uvaferm 43 would be the best choices. I suppose you might
drop the gravity to 0.995, but don't be shocked if this is as dry as it gets.
Perhaps giving it more berries with added acids and tannins will make the flavor more to your liking. Alternatively, you can try adding a little acid blend or tannin to a glass to see if some combination improves it.
I hope it turns out OK.