Buy now as much as you can, then save it in the hardware wallet. Write the the key, make sure that you are not loss the key. Don't be afraid if the price of bitcoin is fall because it will go up again.
OP here
That is a terrible way to trade or invest in Bitcoin.
When a commodity is as volatile as these cryptos, it is much easier to trade both on a short term and long term basis using price targets.
I have bought into Bitcoin at under $2000, sold a couple of weeks later at $4100
I am now waiting for it to fall to around $2500 where I buy again.