Honest reality about crypto

Hello to all experts especially. I would like to personally clarify my doubts once and for all. Because I’m really confused and at the same time fascinated by cryptocurrencies. I would really like to understand if starting today there is really a possibility of having a golden pension and if so, how much would be the right ideal to invest. A few weeks ago I decided and I would like to invest 250 euros per month but only in cryptocurrencies such as BTC, ETH etc. I would like sincere advice. Any, if I should stop, if I shouldn’t stop, if I should put in more, if I should stay on top of it etc.