Have you tried the method of loci? I do a variation of it when I don't have writing means nearby to keep the idea in my head. In its essence, you visualize a familiar place (ie parent's home) and how you walk through it and drop what you want to remember somewhere. Works perfectly fine for me. I suspect that's because of grid cells and spatial cognition (more here:
https://youtu.be/gmc4wEL2aPQ).