Your rank system has a huge flaw

Your ranking system has a huge flaw because of the random factor in promos;

Let's say two players have played 3,000 games:

Player A has won 2,500 games, but is diamond,

Player B has won 2,000 games, but is plat;

The difference is one got luckier during promos;

There are people who afk or feed on purpose in rank, and until this is addressed you should change how promos work and how mmr works;

Update your database, tables, and more;