Dudes don't really go for personality. They may dump a girl who is being a cow to them, they may even see that how a girl gets on with them is important. However, even still a girl who is attractive looking and who they feel chemistry with, natural eyeing up stuff will likely be the first port of call.
If you really are not attractive there are several things you can do:
1). Don't be overweight. That tends to make girls look even more unattractive. It will really reduce the number of guys interested in you significantly. Legs I think are best not thick but not like matchsticks either a good in between everyday average, normal width I think.
2). As said above wear classy, fashionable and slightly revealing clothes but not too revealing. As a guy I think Bavarian style crop tops look nice, sexy but also classy, also skater dresses, short tight skirts or loose very short mini skirts, plain thin tights. Whatever you do avoid jeans particularly the more bog standard stuff, stretch denim stuff isn't too bad but jeans in general shout boring all too serious & mundane personality on a girl. T-shirts again can be unless particularly tight fitting around the breast. - obviously a facially pretty looking girl will look good in anything so I wouldn't go by what they wear.
3). Makeup. A difficult one, overdo it and its not great, do it not enough or not well enough and it won't help. By overdo it I mean avoid fake tan stuff, fake eyelashes, all over face make up. The guy wants to see a real person there not a generic fake Barbie almost like catfish type of looking girl who is covered in fake stuff that you can't really tell who it is anymore. So do some subtle but noticeable eye makeup, do lipstick but avoid strong red lipstick as too ott. Someone who does makeup well in a skillful subtle way can really improve a girl's appearance but that is a hard find these days normally it's just too overdone.
4). Hair. Long straight hair is always a winner it's just so feminine. Short hair is a big no, no and will put of hordes of guys as it looks too masculine. Curly hair is ok but avoid the straggly kind of fuzzy unkept look that tends to not impress.
And there we have it. Do the above and it's really the best you can do. Us guys are pretty desperate in this country these days so it really is a girls market. So long as you look have decent even if you are not all that pretty facially you'll probably get interest from sone guy if you do the above. Good luck.