Honestly I would say you have really bad luck lately. He climbed to gold 1 from gold 5 (placements) pretty quickly but right after he got into gold 1, it went downhill. I've watched my friend play rank everyday and literally saw how feeders and afk-ers made him lose like 10 games in a row, winning one or two and then losing tons more. Like only less than 3 games were lost because of skill level. He got demoted from plat 5 all the way to gold 5 because of the losing streak. But then after that that period of bad luck, he climbed back up and got to diamond by the end of the season. My two cents are, if you're on a losing streak, stop playing for a while and play again the next day or something.