It still is a good investment, but as others said I wouldn't invest all of my money in it. I've invested also quite late but still gives a nice profit
it is never too late to invest in bitcoin, because bitcoin in the future will increase in value. as much as possible if we already know the bitcoin from now should try to invest in it.
You only need to hold your Bitcoin, do not let by a little of trouble make you give up your opinion and sell Bitcoin. If you do that, you are transfering your chance to others and they will earn profit help you

That is right, it is best to make the best out of your bitcoin and you need to put a lot of patience in your investment in bitcoin because the up and down of the price of bitcoin is normal but a true holder is rare so if you want to succeed in bitcoin then you need to have a great patience and wait for the price to pump up.