How do I stop getting depressed over small things?

I'm seeking genuine advise, i know this sounds dumb but please. For ref, I'm 15(F) and quit therapy because talking about feelings would only be a constant reminder and make everything worse so I'm asking for help here.

today I saw an edit of a show that absolutely broke my heart. this is so dumb but it's def a trigger and i just really want to know how to stop getting so sad over small things.

Thank you for your time.

(This is like my first time posting so sorry if it's not under guidelines.)