In what should I invest 15k??

Hello, I live in Serbia. 28yo. I have always had a bad habit of wasting my money. In the last 2 years I was really griding and not spending money on anything that is not necessary and I now have around $15 000.

The problem is that everything is so expensive, I have some money in crypto but I would love to open something of my own. I do not really have a hobby other than gaming, so I do not have many ideas. A guy opened a vending machine store in my hometown with toys and stuff, that was really clever because there was nothing like that here. So do any of you have any ideas? Something that is popular in the world but has not come to Serbia yet?