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.
we're talking with money or fiat rather than with bitcoin. if you choose bitcoin it means you invest? as you can see the price rose a couple of days and will likely rise after halving? and if you have a fiat money now probably a good opportunity for short-term investments and buying bitcoin and holding up halving come.