It could be a couple of reasons but I think it could be the algorithm for dating apps tend to favor more active accounts. Also. there are ebbs and flows of match traffic, for example, you'll have days where there's several likes/matches and then it gets "dry" with no matches.This happens to everyone no matter how well your profile is.

I am (32M) and have dated women in their mid 30s. 27 is still young. Not everyone wants to date someone fresh out of college.

It's unfair and easy to blame a city for how difficult dating is in general. I would just say keep doing your thing and find ways to meet people outside of the apps.