Is trading more stressful mentally than long term investment?
Crypto trading and crypto investment are like someone who can swim and someone who can't.
I mean, if you are good at swimming you will trade well, In fact, whatever your swimming style or style of trading in crypto, spot, margin, futures, you can easily do it without any obstacles, that's the way to play.
Investing, if you can't swim, there's no problem, you can do the above without having to have trading knowledge without having to enter a water pool, that's what it's like, your investment buys a crypto asset, saves it and sells it when the price rises, it's done without needing strategy and style.
You are oversimplifying the issue by comparing trading to swimming.
Learning to swim is not too difficult, and as long as you keep practicing for a period of time, you can eventually master it and swim well. But trading is different. Even with extensive knowledge and years of experience, there is no guarantee you will make a profit. The market is constantly changing and does not follow any pattern.
In terms of investing, it is simpler than trading. But without knowledge, do not expect to reap any reward from it. I have never seen anyone lacking knowledge manage to profit from this market.