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.
This isn't really a "psychology" help, having an income making you feel better is common and it's a financial one. Basically it is saying "have an income from somewhere else, and then you can have an income from crypto trading a lot easier", which isn't shocking. However, if you really feel like you want to see some serious psychology hack, you can always train yourself. How? Well that pavlovs dog thing isn't wrong, if you train yourself day by day, to feel more relax when you are stressed, then you could make it better.
Whenever you are super happy, or made some profit, or basically in general have good feelings, do something, like eat a candy, wipe your nose, make a trigger basically for it. Then when you feel stressed or anxious, do that, and your body will act as if something great happened.