This is the most comprehensive strategy that I can vouch for.
Done all of them.
I would say, the last one is underrated but very much useful not just for getting over a crush but for personal growth in general, which is a lifetime skill.
You'd be surprised by how many adults don't understand themselves or even avoid doing self-reflection. In consequences, stumble upon the same problem again and again without taking different/better approach to handle them.
My problem with some seinen animes are how edgy and how much they try hard with all the "adult" scenes. The older I get, the more I think that gratuitous sexual or gore scenes are more interesting to teenagers, or maybe that's just me being overexposed to that kind of content too early.
Of course like anything else, there are good and bad , regardless of its demographic groups. I have all-time-favorites from all demographic groups (shoujo, shonen, josei, seinen) that are close to my heart. Vice versa, all of them have their fair share of meh stuff.