That depends upon the man. Some men want strong woman, if their mother was domineering, others want weak woman if they want to control the world. So your appeal depends on what a man is looking for in a woman.
Yes, of course, sexual appeal plays a major role. But for a long term relationship to last - and this is what most of us are looking for - the overriding criteria is being alike, of similar nature. Yes, of course I know that opposites attract but alikeness is what makes a relationship last.
With this in mind you should consider that the "qualities that men look for" are often shallow and do not warrent your changing of "who you are." There is a chapter in Meyer's "Marriages, Shack-ups and Other Disasters" on 'THe Great Fallacies' that describes in great detail how to be who you are. You can check this out on the website listed on my Bio Page.