If you write the seed phrase in a special book and are afraid other people can access it, you can use tricks like changing 1 or 2 positions of the words. That way, even if someone steals your phrase, they can't access your wallet. (You just need to change the position of the two words, no need to change too much to confuse yourself).
If you use that on 12 words seed phrase, then your wallet will be hacked in some minutes. If you do that on 24 words seed phrase, be sure that you really remember that or you'll lose access on your wallet.
1. My Trust Wallet Seed Phrase
People shouldn't use Trust Wallet because it's closed-source and is owned by Binance.
My way of keeping my mnemonic phrase is I created an excel file on my google sheets, you can find it on your gmail. Aside from that, I also created a copy of it on my computer notepad that was saved on my drive. I also saved on my notebook, all important information and passwords are in there. I always do that incase I lost one of my saved documents. I experienced losing it before, so I learned from it and I feel secured on that way.
You are a good example of how people shouldn't save not only seed phrases but important information and passwords also. Also, you shouldn't reveal too much about how and where you save things.