If you want to invest do it now. Even the price is not stable but if the market value rise then you can get a good profit even you don't do anything.
Basically you can any time invest in bitcoin but yes now that is the best time to buy bitcoin and hold it for some months because after this time its price will more high and then you will get a lot of profit so i think you should never waste this time and go for investment because the bright future is waiting for you.