We all always seek profits in cryptocurrency trading, if the price of bitcoin soars, will you sell it to buy fiat or altcoin? If you buy altcoin, what is the altcoin that you will buy?
I think it would depend on the situation, if ever altcoin is on a good condition and price, I would prefer buying some of it. I would find good altcoins that has the potential of being successful in the future. If ever altcoin is not in a good condition or it is very difficult to find a good one to invest with, I would convert some of my earnings to fiat, not all of it, cause I would rather hold it still on bitcoin and wait till it goes high again. In terms of altcoin, Eth would definitely be the one I'll buy cause I know its potential.
You should make your own decisions when investing because until now crypto market is still very difficult to predict and altcoin is the riskiest investment in this period. However, I believe that this year will be different and the need to invest in altcoins will tend to increase many times, so consider some of the coins you consider to be the best.
Currently, I have selected a lot of good coins for this period and will buy at different stages until profitable because I am sure the altcoin season will probably happen this year and you should be patient during this important time.