I think good investors are investors who get a profit and they never stop, and also good investors know what to choose and they know when to stop and how much to invest.
only a few investors can always benefit like that because every investor has a different strategy and not always the steps that investors take good, sometimes they experience a lot of losses.
It doesn't mean if you are an investor you will always get a good profit, sometimes the market is not on their side that's why they always have a hard time to manage their profit over losses. Enough knowledge about the market is a very important aspect here or even more on that so that you will not having a hard time to analyze everything.
We lose without own mistake I cannot believe that an investors can lose money without any mistake or because of crypto investment, to be a good investors we will have to trust our investment and never think about lose at any cost, time management, patience, knowledge and confidence about investment, it will increase the price very soon.