I've moved out of the city center & am saving to buy rural land

If my job didn't prevent it I'd get a sailboat and live on that

Is prepping a thing in Europe? I have some food, water & self-defence supplies saved up. I also have a "go bag" with emergency supplies.

In the US these things are pretty common but not universal.

Depending on where you are you might be able to get a long gun. Assuming you can't get a proper rifle (AR or AK pattern) you may be able to get a lever-action rifle or pump shotgun, both of which are perfectly fine self-defense tools. A break-action shotgun or bolt rifle would not be ideal but would be serviceable. If you can't get any of that you might have to go for some ghetto shit like a crossbow or air rifle.