Since other posters already suggested good ideas, I'd like to share one sort of "unorthodox" way of storing your mnemonic phrases.
Memorize it. Yes, you heard that right. A 12-word recovery seed is a lot easier to memorize that most people thought(though memorizing 24-word seed is still possible, just significantly harder). But I understand that this is definitely not for anyone.
This is very wrong because you can easily forget it
yes, memorize is not a good way, maybe u memorize it now, but if u do not use it, maybe a month later u forget it.
I often split it in two parts, one parts save in difirrent USB drive storages and the other parts wirte in papers and save in discrets place only i and my family know.