Saving in Bitcoin

I’m going to start saving in bitcoin. I have been reading into it and I have now truly understood what Bitcoin is instead of looking at it just as a crypto currency.

I have already started saving in bitcoin but I was wondering if you still try to time the market? For example do I hold more cash to put in for the big pull backs? Or should I be buying still at all time highs as well?

Any serious advice would be appreciated!