The most important with making an investment that you have to choose the right moment to sell it and that is the moment that you can make profit.
I think its better if we buy more then 1 btc if possible, as we are sure that price will go high at the time of halving so if we have more bitcoin then we can make higher profits.
But the bad thing is that you dont know what the right moment will be and that is the problem.
Indeed there are pretty high chances to make some nice amounts with the bitcoin on a long term, the only thing you need is patient.
If you stay believing in it and hold your bitcoins you will make profits for sure.
Yes patience is really important when you are investing your money in bitcoin as majority of people gets panic when they see lower price,but you need to hold it for a long time.