Just use norms to practice and get better. Playing against plats & diamonds regularly is a good thing. You will have to be a better player to go even / win and any mistakes you make will be more noticeable and punished. When you go against just silvers after getting used to that higher elo it'll be much easier.
I'm in Plastic XII and my last game was against a team consisting of 3 unrankeds (Last season unranked (66% win rate on 9 out of 10 promo games), Gold 5, Gold 3 respectively), Silver 3, Silver 5. There is absolutely nothing wrong with that. I like that my solo queue norms consistently give silver, golds, and the occasional plat. It'll improve my play in the long run.
The only issues that arise from it are the mind blowingly large egos and toxicity the golds / plats and former golds / plats have. They use rank as a excuse to be arrogant to the extent that they will just mindlessly bm and insult players even when they're being outperformed in all aspects (Objectives, Cs, KDA). There is no excuse for this at that elo. Toxic bronze & silvers acting in this manner can at least be excused for this behavior due to having no meaningful knowledge of the game. Golds and above should have the knowledge to see just how stupid they're being.