Majorly, I tell people that the safest and most secure way of keeping your wallet safe is by creating a secure file and storing your keys there. Something that only you have access to. You can also write out on your personal diary, or anything, but the key thing is that only you should have access to it, or if any other person should have an access, then it should be someone trusted.
As much as possible I organize important files related to cryptocurrency in one folder. Then duplicate it on several devices and applications, this makes it easy for me to access and monitor it from my device that allows it. In addition to maintaining security, we must also wisely use the internet so that there are no loopholes for hackers to hack our devices. May we always be safe.