So you have 1/2 an acre of land in central europe and you will be living on it.
Central Europe is cold. That's great!
If it is wooded, you should grow American Ginseng on it
Definitely a good idea! I need to check regulations for sales, though. But I plan to plant some fruit trees which will need 7-10 years until the first harvest, so why not do my future I a favor and widen the portfolio! Thanks for the hint!
Fish breeding, Verticle farming of high-value plants, Mushroom farming, Cricket farming. Grind those little fuckers up into flour and sell it to hippies and liberals on Etsy. Become a serial killer and bury bodies there. Build a bunker and rent out seats to doomsday preppers. Grow out a beautiful garden with exotic plants and rent it out as a wedding place. Rent out small garden plots to your neighbors. so many possibilities.
I'm not into killing life of any kind, so fish and cricket are out. Let them enjoy life just as you and I do. Although the serial killer thing sounds tempting. Even just burying bodies as a service, using them as a filler in concrete - so many possibilities! Also the bunker thing is something I already thought about briefly. You have lots of powerful ideas, my friend!
Put up a greenhouse and grow AAA weed.
Homegrown food food is always the best! But maybe not the best idea to do that in your backyard.
I'd put a big pond on it where
@Willyfish could feel happy.
That's it, a happy place.
I might invite both of you and we'll start a porn production company. Deal?
I don't know about your country regulations, but if that land is in my country I would build an electric gas station since the demand is picking up here.
This might be an idea. But I fear that 1. the place is not crowded enough, 2. the lifespan of an amateur charging-station-guy might be limited and 3. I'd prefer not to have too many cars on my land. But still worth to consider. Thanks!
If you want the easiest way possible then have a look at Glamping. Set up glamping tents and list them on Airbnb. People in a city are always looking for an escape to the country side. Add a bunch of experience based stuff along with their stay and you'll be a hit in no time.
Edit : Sorry just read your reply above that you don't want to host strangers on your land. Can't think of anything else other than growing your own food if the land is fertile.
Construct apartments and rent it.
Definitely something I thought about! But rather than being dependant on more income in the future I plan to need less money and rather enjoy peace of mind and peace of space and sound. So having an abundance of fresh lettuce in the back yard is worth way more than an abstract number on the bank account. But still thanks for your edit!
Thank you all a lot for the input! This idea is forming in the progress and you guys help me to shape it just a bit more. So if anyone has the need to throw in her or his two cents, please make yourselves home.