Successful investors are who can get profit from their investment and by that I mean they actually took profit from investment and use it for having things that truly improve their life quality.

By that they actually convert their investment success something that are helpful for their life and don't let success exists only in their wallets or on the computer screen. However if you already exited the fiat system, you won't want to return to it, and they can continue holding remaining bitcoins after already use part of it for life quality improvement.

The bottom line is, success only exists if it helps you in life. Like in trading, profit is what you take, not what you only see as it can turn to loss tomorrow.