You can use software that allows you to create a wallet with a seed phrase of 12 words.
It's not impossible to remember 12 words if they are very important. This way you can keep the wallet in your brain. Also known as a bitcoin brainwallet. No one can steal your thoughts.
In cryptography we trust (& verify).
Nice idea. Backup phrases with brain memory are very effective, but I doubt this is done by people with memory problems.
To access a crypto wallet all we need is a key phrase. If we lose the phrase we will not be able to access it. Therefore, backup other than on the computer is important, maybe we can make a copy of the phrase with several alternatives. Natural disasters, war are unexpected factors, to anticipate these undesirable things alternatives such as writing phrases on iron plates, printing 12 phrases on paper or something similar are very necessary, of course we have to consider this option which is resistant to water and fire.
OP, I'm sorry for what you're experiencing, to help your problem now is your memory, because a BTC wallet without 12 Phrases is impossible to be access.