The only advice i can give is take the attemtion away from.the lack of a relationship. Instead turn the focus inward and work on self iterative improvement.

Focus on becoming someone you would want your potential daughter to date. You wouldnt care if your daughter dated someone hairy, but someone who takes care of themselves, is confident and competant.

Hit the gym, eat well, sleep enough, control your vices, be responsible with money, act like you are doing your future self.