Well, there is no any particular amount or rate that can be a yardstick to one's investment in crypto coins. I believe that should be based on one's income and also the reason one is investing in crypto.
The truth is, it's the higher the amount of investment, the higher the rate of profit or loss. That's why one must be more particular in selecting projects with potentials and have utilities.
For example, I have got bags of $Arcade token and I have been earning reasonable rewards. Arcade gamefi platform allows token holders to earn meaningful rewards, from various Play-to-Earn metaverse games, without requiring gameplay or even NFT ownership.
I can assure you that, any amount invested in $Arcade will yield massive profits. You should check it out.