When a coin moves forward to a hard fork is it for good or is it for bad? do you think that its price will rise or fall ? would you invest on a coin that has done hard fork? and what would you do if you own a coin that has announced a hard fork? would you sell it or not?
There is always a reason for every fork that is done. So it is to have a better result, which means you should get better reward.
Even if the price dumps, in the long run, it will still rise, because the upgrade will pave way for mass adoption.
You just need to ensure that you get a good coin, whose fork is intended.
You should also be the one to decide whether to sell or not.