Am I hardstuck?
Maybe not. Two numbers you can check tell you more than the feeling does: how strong your lobbies are next to your rank, and what a win pays next to what a loss costs.
Enter your Riot ID and Vantage reads both from your last games.
Signs you're climbing, even if it doesn't feel like it
Your lobbies are above your rank — the other nine players are, on average, a division or more higher than you. And your wins pay more RR than your losses cost, say +22 for a win against −15 for a loss. At +22 and −15, winning only half your games still adds 7 RR every two games: keep playing.
Signs it's your level right now
Your lobbies sit at or below your rank, and losses cost as much as wins pay or more. That is not a curse on your account; it is the system placing you where your recent games put you. The way up is the games themselves — Vantage's coaching shows which maps, agents and habits are costing you rounds.
What Vantage checks
The lobby check compares your lobbies' average rank with yours over your last 20 games, and your RR per win with your RR per loss. It only says something when both point the same way and there are enough games to read — at least 10. Otherwise it stays silent rather than guessing.
It is free, needs no login, and reads only public match data. Anyone can remove their profile from Vantage at any time.