Lone artist mythos aside, for most humans faith in oneself is a social thing. You might consider fresh situations which put you in simple contact with others. Volunteer work, re-connecting with friends or family, or anything like that which involves conversation.
Second to this is just physical activity, long walks or anything like that.
Just a suggestion, I have no idea about your situation. But I know these fundamentals often improve my own perspective. A vacation can be huge. I went to Moab in the spring and it was seriously refreshing.
If I catch myself ruminating, I know now the fix is simple: do something like that stuff or anything which gives my mind some other interest.
Online sociality is physically lonely, and it can't really nurture the soul like a conversation or a walk, though it can certainly help us to learn and discover choices.
I was amazed at the psychological advice on youtube 🙂
On the other hand a lot of great Art has been made by deeply unhappy people LOL