I think you should invest now. The values may be a bit high right now but if you wait, it will get even higher. You may have missed the dip but it doesn't matter since there is no perfect time as to when to invest. What matters is how much you are willing to invest and if the coin you are investing in will surely give you slme profit. Though it is advantageous to get some coins at a low price but it doesn't directly affect you profit; the difference is not that huge.