How can i stay in a good mood?

so i've been kind of broody for a while. and by a while i mean a long time. like i won;t say much, just kinda sit there, not really taking part in anything going on, kinda quiet and invisible. However, starting a couple of days ago, I felt really great. I felt so sociable and i was getting along well with my castmates in my play, we were all joking around and i felt really good and liked. now however, i found im back to being broody and for no good reason. that brief period tho (the good feeling lasted like 2 days), was the happiest period i've had in a while. wat can i do to make sure everyday feels that way?