You are very positive, which can also lead to losses. I mean, if you bought at the time you posted this, you would have profited around 30–40%, which is also good, but still, it doesn't double your investment. But again, you bought it at a cheap price, which is why it is always best if you can buy anytime and accumulate it because the price keeps increasing. Also, if you still wait until you can afford to buy a whole bitcoin, then for sure the price at that time is higher. It is better to buy it in small amounts than one time.
I also think that buying in parts is a more profitable strategy, but it's up to everyone, everyone must decide for himself what is best for him.
You could buy a whole bitcoin when the price was 20k, or you could buy in parts and the average purchase price would be 25k. In some case, the benefit will be better, but in general it can be approximately the same result. It is possible even now to buy one bitcoin at 30k and it will not be the worst investment option, as I believe that this will allow you to get at least x3 in the upcoming bull market. This is a very good potential profit, I do not know what assets can give such a potential profit, for each of us.