Your view of the clipto market is wrong, look at the case of BTC, you think it only goes up or down, I think it only goes up, that's why I only sell something to capitalize.

What do I do when I'm in profit?

It's important to know how to measure the profit, because not everything goes up forever and in the crypto market a "hangover" can catch you off guard, without protecting your capital.

I divide the chart with 4 lines from the entry point to the top.

When it reaches the top, I sell 50%. If it falls to the first line, I sell another 25%. I stop at the third line at the remaining 25%, above the entry point.

If the value goes back below the price at which I had bought, I make a new entry, analyzing whether with the same capital that I had bought before or more, because the profit is already guaranteed, whether it is in the account or even having bought another currency (which in this case was free with the profit made).