It is okay to evaluate the value of the investment. But what advice would you give to those who can afford to invest some amount from their income? No one invests with all their money. They invest as much as they can and hope to make a profit. However, it is not bad to invest with all their money if they can maintain it. And they are able to keep their daily expenses, emergency fund and reserve fund. An investor should always invest by deciding the time for how long they actually want to invest. And no matter how many obstacles and dangers come during this time, they will not lose their investment. If someone invests by deciding the time, then it is expected that they will be able to make a profit from their investment.
For example, you invested for a long period of 4 years. But you sold the investment after 2 years for some urgent work. Your mistake there was that you lost the investment because you could not maintain the timing. Just as there is a need to allocate money in investment, there is also a need to allocate time, because time is the most valuable thing.
You ended up contradicting yourself here buddy. It's not a good financial activity to put all your money into Bitcoin, I don't see a chance of maintaining it since expenses keeps coming and most be sustained, else it would weigh you down and you'll have to remove part of what you've invested into to take care of your expenses which is a bad practice.
Beyond expenses, it's a very bad approach to invest all your money when you've not built out your backup funds and most especially your emergency funds to be equal to at least three months of your expenses budget. If real emergencies occurs, your portfolio is still at risk of being tempered.
Like the topic suggests, it's important to create a kind of balance in your investment life in order not to mount undue pressure on yourself in the course of following up your investment and it's essential you apply good cashflow management practices in order to navigate your investment journey more efficiently and effectively and be able to maintain and sustain it for a long-term.