As a trader, it's not good to rely solely on trading as your only source of income. Why? Depending solely on trading puts immense pressure on you to meet monthly bills. The consequence? You may find yourself taking unnecessary and low-quality trades.
However, when you have another or multiple other sources of income alongside trading, you can stay relaxed and have the mental comfort needed to make quality decisions. For example, you can be a trader and be a Bitcoin miner.
Do you have another trading psychology tip to share with me?
I'd support you in everything you said apart from the part where you said one can become a Bitcoin miner. The reason is that individual mining is not profitable anymore unless someone is ultra-rich and can afford to create a mining farm with a lot of mining equipment and for that, they will need to make sure they are getting electricity at a cheap rate so that the coins they might mine shouldn't go in maintenance of the mining farm alone.
You are right about trading having another source of income when they are trading, especially when they are new to it. Someone experienced might be able to become a full-time trader because their mind becomes mature after some point and they can make sane and critical decisions even under a lot of pressure.