1) Get a good sleep schedule. That is key.
2) Keep a mood log until you can figure out what can cause an episode.
3) Learn to have self-compassion. If this was an easy fix for everyone there wouldn't be a Bipolar forum.
4) Develop a self-care routine. Little things will add up.
5) Have support. Whether it's a therapist, support group, whatever--have people you can talk to.