I am a guy.
No matter what you do - if you are not the guy's type - you just can't seem to get noticed positively as you would expect.
The best way to get notice positively is simply to be YOURSELF.
That way - good guys - will see you and value you as you are.
Never flirt - this will give them the wrong impression. And if they notice you - they notice not YOU, but the message. Nothing lasting.
Be yourself - and the guy who is just for you will soon come to you.