is currently very difficult to find a place for investment that will really give you an advantage, because from my experience it will lead to a scam, but if there is still a reliable investment I also want to know
If you analyze well I think there are still some of gambling site which open investment. You just need to search and find a good review. I can recommend bitvest, just-dice (clam) and moneypot
Crypto-games also has a very intuitive invest option, and the added benefit that you can also invest various altcoins into relativily small bankrolls.
Meaning that you could still own a pretty big part of those bankrolls and make a decent profit.
These is their house edge, which will determine your profit in the long term:
Dice has a house edge of 0.8%.
Slot has a house edge of 1.97%.
Blackjack has a house edge of 1.253%.
Lottery has a house edge of 1.5%.
I have to add a warning though that you should always expect that they can dissapear and take all your money. Not saying they will, but I consider it a risky investment.
Also you could end up losing money due to variance.