Most people’s ELOs don’t shift much after settling into your “natural” rank, which should happen after about 50 matches or so.
Ehm, 50 matches seems like a lot to me. Especially if they aren’t enjoyable (yet) because of flawed matchmaking.
I pulled that number out of my bootyhole because I knew it was a safe bet for a stable ELO.
US Chess Federation uses 25 games as your provisional ELO stage, many video games will use 10 matches. Assuming a large enough variety of ELO in the player base, you can be confident your ELO is mostly accurate after a shockingly small number of matches.
Would be interesting to see but I would assume most people won’t even make it to 10 matches in a game they don’t enjoy. The people who spend thousands of hours on a single game are a tiny minority of the tiny minority of people who have the free time to play dozens of a hours a week.
If you can’t make it 10 matches in a new game, I don’t think SBMM is your problem with the game.
10 matches should be like, between 3-10 hours. Assuming an hour a night, you’ll be approximately ranked for SBMM within a week.