You’re statistically far less likely to be someone’s cup of tea than you are to be highly compatible with them; that’s fine, don’t compromise too majorly or try too hard force what isn’t naturally fitting.

We often tell ourselves this narrative that we could appeal towards nearly anyone if we just adjusted our approach but that just isn’t true; there will obviously be people who immediately disqualify you because you’re not physically and socially or professionally desirable to them, but there will be others with who you could probably make it work if you conveyed a persona that wasn’t true to you. My advice is not to bother

Working out, grooming, maintaining hygiene, forwarding your career, cultivating interests, learning from criticism and so on are important for their sown sake - and will help raise your appeal - but find someone in the minority of people with who you feel like you need to make minimal adjustments for; otherwise you’re undermining your own self worth and delivering yourself to an unnecessary struggle to maintain a facade which sooner or later will come unstuck.

This applies more to relationships more than casual sex obviously, but in either case, you should always be true to yourself. If someone doesn’t like you for you, find someone who does.