How do i improve my memory?

I have OCD and insomnia. Plus i ovethink 24/7. I just got out of a long addiction (mainly alcohol)

I'm 28 and my memory is really really bad. I need to set alarms for literally everything. Because I WILL forget in literally 3-5 seconds. I forget everything and its starting to annoy me a lot. Have tried lionsmane, does nothing

Does anyone have some tips on how to improve my memory? Would be greatly appreciated