Its depend on your your own think. However these days bitcoin is going high and this is profitable for everyone. after halving price may be came down. So profit of investing in BTC depend on time duration.
But even if you invest bitcoins in sites you are not going to lessen them, right ? Then why even do not invest them ?
I mean price will increase is better for you then. I do not understand this logic of saving them.
Well the logic of just saving or holding your bitcoin is that you are just storing them and reserving them for the bitcoin price increase.
And when the price increase happens so the value of the bitcoin you are holding will definitely increase it's price for dollar.
When you sell it, your profit becomes higher when the price of selling of bitcoin is high.