How do I solve my learning problems?

I have good comprehension skills when I read something I understand it well but the problem is that my mind doesn't memorize it because I'm always tired.

The other day I applied some techniques to improve the absorption of my knowledge, I tried many things, repeat, make plans, expose what I learned out loud and even use the association technique that the psychologist suggested to me and it worked well, I memorized it and it lasted 8 days and then I forgot everything and I made the effort and I couldn't remember and I don't know what to do anymore, sometimes I even forget things immediately, I tried going to the neurologist and he just sent me to put together many puzzles (I did it and it didn't work)

I have taken vitamins and it does not help me at all.
How do I solve my learning problems?
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