How to get ex girlfriend back?

I really miss her tbh... and I think I really screwed up by breaking up with her. I broke up with her a couple of days ago, due to relationship issues (please see last questions), but since the breakup she’s already getting attention from other guys. I know she’s not mine anymore, but I’m really jealous seeing her hanging around with other guys, knowing that the breakup was my fault. I miss having her all to myself, but I don’t think she’d take me back even if I tried (see previous questions for reference). I need some tips on how to try to win her over, or at least try to get her attention. Thanks
How to get ex girlfriend back?
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