I Want Him To Notice Me

Hi, I'm a girl of 20. I recently broke up with my ex-boyfriend, but I completely overcame the separation and now I realize that I want to be with someone else. I have been keeping an eye on a boy for a long time - a year older than me, a sports person. I took the initiative and sent him an invitation for friendship on Facebook. He received her the same evening, but I didn't see him online for about a week when I spotted him 1 night. I wrote to him, he answered friendly, but in 2 lines, I asked him another subsequent question, and he has not yet answered (he has not seen it). 5 days have passed since then. I know where it works and I know when I can spot it because I worked in the same department in another store. My idea is rather to attract his attention while he is at work, for him to notice me and not remain indifferent. It is very likely that he does not recognize me and does not remember that I wrote to him. How to get his attention, are there any tactics to use, how to look, to talk to him? The question also applies to men? You, if you were in his place, what girl would you pay attention to, what would attract you to a woman, what would you be impressed by? Thanks in advance for your answers