You already have the basic notions of this sport, you know how to handle the kite in the water enough to be able to continue practicing without the need to take more classes from beginner level.
However, you do not have the necessary knowledge to get out of trouble in the water, to feel much safer we recommend that you practice with a specialized guide nearby who can help you or give you practical instructions if you need it, so you will improve your technique and avoid taking many risks.