Thanks for your replies!
I know that my explained strategy seems risky, and I’m well aware of how I could lower the risks of my savings. I just thought it’s worth telling how I widened my perspective on this crypto thing. How I started to consider my other needs, like my time, my peace of mind and my environmental awareness into the equation, and how it lead to choosing one crypto to my liking and values and standing behind it by buying little but regularly.
Every tool that lowers the risk of investment is based on lowering expectation. I just found that instead of complicated diversification and/or complicated cross betting simply lowering my expectation in general and diversification by time does the trick without fragmenting my support to projects I’m not aligned to completely otherwise. I also realized that I can use the time and effort saved for creating more value and earn more with my job.
I think that the crypto market is overly fragmented. I personally don’t need 1000 different cryptos. ADA can do what BTC and ETH can, but in an environmentally sustainable way while staking gives me 4% a year. The question is will it stay or will it go to the ground with my precious 4%? 
I think sustainability will be more and more important for everybody on the planet, the crypto crowd included. I also think the community behind Cardano is dedicated, decent and cautious enough to not screw things up too much.
Which leads to the conclusion that while you are all right, it’s somewhat risky, yet I’m pretty confident that it will make what I expect it to make.
Cheers,
Mate