What i feel is i should have made a move at that moment😓

Me: Hi i have posted about a girl that i saw in train and im really waiting to see her again in my life but through reddit i think it’s a waste of time to wait for her and i lost hope. Should i delete the post or wait for something to happen… Even if the possibilities are very minimal i would be very glad if she saw this post in her late life…. What should i do now?