How come we lose so much LP and gain so little?

I just lost a game and lost 21 LP, and before hay I won’t a game as Nami support with like less than 5 deaths and more than 20 assists and won 17 LP. Why is riot making it so hard to climb for low elo? This isn’t fair at all. I was legit on the verge of getting into promos and because I got 2 inters (jg and top) we lost and I lost FKN 21 LP. Riot fix your shit cmon
Report as:
Offensive Spam Harassment Incorrect Board