You probably need to figure out what it is that makes you lose interest. I might actually suggest trying to tag out, if you want to get crosscanon that interests you? That way you can control whether it's a canon you know and like, and spend some time matching the vibes to whatever interests you about your canon in your starter. But if what you like is just the dynamics between the specific characters and their established relationships, then no amount of vibes matching will get you there.