Here is a thread that was the culmination of a lot of discussion last time this came up.
As you will see there, I initially thought that the 1500 pt (13k) starting rank was giving us the bad experience reported here, and opened that thread to discuss it.
What I learned, and you can read in that thread, is that the 1500pt starting rank is chosen for the stability of the ranking system.
I don’t understand why that is - I have taken it on face value because experts say it is so, and you can read about it in that thead.
At the end of that thread there was a proposal for “humble rank” to solve the matchmaking problem that this starting rank causes.
This is supposed to ensure that new players are treated as 19k for matchmaking purposes.