Usually to manage stress what I do is not to think about it too much, I accept the loss. There are 2 ways that I do, firstly selling some of the tokens and secondly holding it for some time.
for diversification is not easy, but I will pick some of the top coins and invest a little into new projects based on my analysis.
If you don't know how to manage the stress everytime the market dumps easily, then you are prone into more losses. I suggest have your own plan and set your own goal. Even if the market tends to move sideways, atleast you know exactly what you are going to do. Even selling your coins and buying another coins should always be in accordance with your plan so you won't come up regretting in the end because its not the right timing yet.
And its a good thing also that you should not think much of the stress. Enjoy what you can enjoy and make as much profits everytime you see opportunities in the market. It also a matter of right timing too.
I admit that sometimes I also get stressed seeing prices suddenly drop, but the stress we experience must be controlled. If it will not affect
the decisions that will be taken, and if stress is not managed properly, it is certain that we will experience losses. It is not easy to manage stress,
but if we try and have a strong will, stress should be well controlled. Start with good planning, it is very effective in making us avoid stress,
because we already have a plan of what we are going to do. Suppose the market suddenly goes down we can keep holding or cut-loss and buy again
at a lower price, depending on the plans we make. And always make alternative plans if the main plan doesn't go well, it will make us confident
with whatever the market happens.