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.
I will suggest following things if you run out of money during such a great opportunity just like last week:
Trade your altcoins for bitcoins.
If you can take a loan from family or a friend take it to invest in bitcoins.
In worst case scenario you can give your house on rent or lease to someone to have money.