Hidden mmr is killing me

Came back to the game after a couple months and I’m being put in lobbies where everyone is plat minimum. I’m getting destroyed every game. I don’t even know how I can improve and get back to a standard where I can compete against players I previously could. Is it worth smurfing so I can actually play against players my level? I feel as though that way I would have an opportunity to improve. Hidden mmr feels antithetical in this way, while it does keep experienced players and new players separate it makes a long time player such as myself want to quit