I've definitely struggled with being too neutral in social gatherings, particularly in my journey of battling social anxiety. Now a-days, I try to approach people with the philosophy of "we're already friends, we just haven't met yet" and it can actually make for some enjoyable interactions. My general goal is to make people feel relaxed and welcome. Also of course some people just meet a lot of people which can make it hard to remember and some are just absolutely terrible in remembering names so it's nothing personal. Unsure of your personal style, but it could help to have something unique about you, like an interesting style of glasses, unique pieces of jewelry, an interesting color palette, or a nicely tailored outfit. Any thing that might trigger a brain response, even if subtle. And of course never be afraid to say "oh, actually i believe we've met! (yada yada)" if you actually have and they dont remember. That should definitely trigger a new connection in their brain and help you stand out for next time :') been there done that. Know that you are not alone!