Usernames aren't a dealbreaker! Unless its something egregious akin to an xbox-gamertag from the mid 2010s (Think Xx_ShinobiSlayer_xX), not much of a turnoff at al!
I think what's more important when it comes to searching for partners is
- Your RT above all other things (Kinks, limits, plots, expectations, a little about you that separates you apart from other writers on both ends)
But some other things that might play a role for interested writers are:
- Your activity on the site (Other rps for writing samples/Journals to get a window to your thoughts/Your profile posts for your vibe/And who else you write with)
- Your avatar (Typically a good eyeball indicator of what you like (irl avatars have tendencies towards irl fcs, anime avatars have tendencies towards anime fcs, sometimes you could even glean kinks from avatars too!))
- Your username (Yours specifically is completely fine)
In that particular order specifically!
But also, MxF is a very tough category to hook writers into in general, especially when compared to RTs in the FxM category!
Main advice is just: Don't give up, interact with others you think are fun or interesting, put what you're interested in up there, and if you're really feeling the craving to write with someone else, take a look at other request threads too. Who knows? You might find yourself pleasantly surprised!