Don't be greedy and don't let your emotions take over. If you don't have the fiat to buy more crypto then don't. Simple as that.
There is no point of getting greedy and thinking of kore money every time. Sometimes you need to be little patient as well. I think if you think this thing that you can avail that opportunity in the best possible way, then you can go for taking money from someone else. But then you have to play very safely.