I think after two years of scam and money lost, i can say that crypto is more the power of scammers than the power of people.

I feel like you are half true and half wrong with this statement. Scammers are not in power here, it is just that the tech is so new that most people don't understand the ropes yet. I still know people who are getting scammed via phonecalls so yeah the understanding of the Tech matters.

As for investments and getting some sort of Income from STEEM you can certainly try out Steemmonsters which will indeed cost you about 10 USD to buy the basic pack but you can recover that almost within a month and then move forward as you wish. If you wan't not to Invest Money before trying out the game then you can join discord groups and ask for a trial account and there are plenty of people that may give access to their Steemmonster account for a month so that you can learn the ropes for free. Plus depending on the person you may be able to get some free DEC as well.