should we change our coin according to crypto trends
What do you mean by this? You have to be clear.
Changing coin according to crypto trends is meaning what exactly. You can sell your coins to buy another preferable coin if that is what you mean but you should explain better. If the hype of a coin is interesting you, you can make a shift but altcoins are mainly almost same, hype and dump.
It looks like the OP wants to buy altcoins, around which there is a hype, but in this case there is a very high probability of buying coins at high. And as we know, almost 100% after high, a dump happens to the coin, which leads to the fact that you either fix a loss or become a long-term investor.