For those who already have investment when Bitcoin was still cheap, I think they can still top up more if they have the capacity to do so. Money is never enough, and what I can guarantee from this time All time High is that we will surely see double the price of the current value that we have now, so there is still more opportunity to take profit.

For those who are yet to invest, there is no advise again other than they have to be very fast in getting Bitcoin now, there is possibility of this surge to still retrace, so they can just buy little now, and then wait to see if the market will retrace again for them to invest on the next big dip value which will favor them more than just jumping in to buy now.