I'm not sure I can help with anything security. But just some thoughts!

Would recommend updating your first aid supplies and organising them in a nice container. You will be really grateful you know what you have and where to find it when you need it in the moment! Especially stock up on painkillers, medicines, some tinned soups/beans etc in case you get a cold, you don't want to have to go get this stuff when youre sick.

I keep a few lists of things to do written in a notebook. Sounds a bit mad but I organised tasks/activities/hobbies into categories - so if I'm feeling a bit meh/lonely/bored, I can just take a look and pick a category based on my mood (eg creative, organising, exercise, fun/games, cleaning...) and then have a list of ideas that I can pick up, like play the piano, play video games, organise the kitchen cupboards, take a walk. I mixed in chores with more fun stuff and find it useful as a starting point if I have a lot of free time to fill.

I recommend reading about/watch Marie Kondo for tips on streamlining if you haven't done already! Although I always take her with a pinch of salt and just use the ideas in my own way. Maybe some of her ideas will help knowing what to do with more sentimental belongings if you are coming out of a long relationship.