The Brief: Tryna means "trying to."

DEEP DIVE
Tryna is a more casual way to communicate an intention to do something, such as “gonna” in place of “going to.” It is synonyms with finna.
When ur tryna save up but people keep inviting you places pic.twitter.com/mEgu8mlvL2
— Reyes (@aminareyesss) February 19, 2019
i'm just tryna be better than i was yesterday
— AMILLI (@amillionbuux) February 19, 2019