This is why depressed incels exist, if you get rejected or simply ignored too often your self-esteem and well being are going to get worse. People (and some incels too) think that getting laid once or getting a gf solves the problem, NO it doesn't. To truly solve the problem most incels should become attractive to the point that having genuine (not paid) sex becomes something relatively easy.

Personally I consider a probability of success of around 20% the minimum acceptable