I see a lot of websites which offering double your bitcoins (lol) and games like farms (but when you try to search about it you see - its scam, doesnt matter that website looks really nice and professional) so Im looking for some really trustfull website to invest if there is something like this? However farm idea sounds nice, but is there any really paying farm game?
Every single thing that you mentioned in the post is exactly the things that you have to stay away from. You should never believe in any of that. Do you seriously think, someone will give you some coins for free just for sending him the money for some time ? Is this logically acceptable by you ? Of course not.
You're exactly the type of person who scammers are looking for. They're looking for someone with some money with him and who is desperately trying to make them increase in any possible way. So they deceive you by creating some fancy-looking websites and tell you some lies that you believe.
This is all plain greed. Don't be greedy and earn money the right way.
You can earn just by investing in bitcoins and altcoins themselves. The markets go up and down every now and then. So that's a thing you might want to try and learn more about. But again be careful as some people will drag you into buying useless coins so that they can sell theirs.
Simply educate yourself before doing anything and no there is no "easy" way of getting more money. Try trading but there's risk. If you don't want to do anything considered "tiring" just leave them as btc and sell them when you think they're high enough.