1. Write your seed phrase on a thick or strong paper which can not be destroyed easily, and store it in a safe place like in your PC motherboard,
if you have a wall without plaster then remove on block and make a hole in it and store there,
2. making cross word question and answers should be you every seed phrases, like we see in newspaper write 12 questions and their answers should be you 12 seed phrase, and store it in safe offline place.
3. one idea to store your seed phrase should be very complicated and secure, if you lose other backups then this will help,
like:
utilize a reverse alphabet code to encrypt each word in your seed phrase. create a legend for the encoded version so it may be decoded later by using it as a guide.
write your seed phrase in mirror writing, going from right to left. when required, use a mirror to read the seed phrase.