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.
Two meanings.
1. He is a part of the team of an altcoin project and they are intrigued about changing the name of it using the trend.
2. He has a portfolio of different altcoins with old names and not on the trend and he wants to sell them all in exchange for what's in the trend.
That's what I understand but if you include the title in the theory, I think the higher chance to be right is number 2.
OP, there's a bear happening, and if you sell them all now I don't think you will be in profits but mostly loss. Try to be at ROI first before switching or if you have more money buy them like you are a new investor again. But, I don't recommend what is "in the trend". Most of them are short-term or worse scams.