A protagonist who just is constantly taking L after L but it isn't because of him, its the odds he's up against
Havent read any novels like this but there are novels where sad/weak ppl change for the better I was Rejected 10,000 times by My Childhood Friend, but After I Gave Up, I Suddenly Started Getting Popular? Experimental Log of the Crazy Lich Re:Zero maybe fits SSS-Class Suicide Hunter (haven't read but synopsis looks like it fits)