If I have money now, I would buy half of bitcoin because in next three months it will double the current price. This is real because it always occur this way after 5 years remember in 2011 and 2017 from the market charts and caps. And this year will break more even.
I mean that is what we all believed that bitcoin will surely go to skyrocket in the Bullrun and this is the best time to purchase bitcoin since the market price is still low and there is still a lot of room for profit in the future. But it still that guarantee that bitcoin will reach a certain price in the market or even break its latest All time high, I mean there are always so many factors that could easily affect the market price of bitcoin and for example, a war that might affect the price so there is always a big risk on investing on it.
Also in investing in the bear market your gonna need a lot of funds since it just means that you're investing for the long term and if you don't have enough funds to sustain your self you might just end up selling your bitcoin in an unfair price in the market so I suggest to always invest only a small percentage of your money.
One of the best ways as well is dollar-cost averaging to minimize the risk of your bitcoin investments.