Selling the bull and buying the bear is the perfect way of doing trade. When we talk of holding, different users have got different views. Some decide to hold for a reason, some just buy and forget it. Some keeps it idle, for those people it is good to observe the market and sell when the market is bullish and buy back when the same turns bearish.

Also what OP have suggested is also good, when we find one of the cryptocurrency under hold is in the bullish move  go sell it and buy some other potential coin that is in the bear market. This practice is good, because we'll get understanding about different projects than sticking to limited projects. However we need to be careful while swapping from one to the other, because we need to go through different parameters before investing. Later it shouldn't be a tragedy investing on a hype coin and suffering to sell.

If I am given a chance to go back to 2020 I would hold my ETH very tight and never let go, when covid was hitting the world at its best I thought it over and I sold 24 ETH which I bought at 120$ each, I never knew I was so damn lucky to buy at that price, learn to hold tight if you believe in a project, there are countless of projects in past years that are way bigger in value right now.

The way everybody understood is this
I buy coin and check everyday it goes up but now it dont move and bull traps.
So wich coins grow everyday ? There is no such a coins?
And why nobody dont create the growth coin that will have large suplly but the supply will getting smaller by the time and coin never fall just going up so everyday i wake up and earn money thats what we need in crypto so passive income everyday and coin is growing and growing.

but it is always accompanied by patience and not greedy in the actions to be taken. because sometimes the profits that are already in sight are released because of greed to produce more, but instead the opportunity for profit is lost and missed.

I agree with my friend above, if you have already benefited so that some assets are transferred and stablecoins or potential coins are also very good for savings.
because when the price increases, we can immediately release it and some of it we hold on to with a bigger goal, or buy more potential coins to save.