if i have 13 bitcoins i would save 10 btc into cold storage and 2 btc for invest by buying an altcoin and i would spend 1 btc for playing my favourite gambling games blackjack
Indeed, I think this is one of the best tactics that is possible, just invest some bitcoins and hold the other one for the future that is coming, or for the halving that will let the price increase for sure.
I think its good to hold your bitcoins right now because the halving is coming and the bitcoin is also getting bigger everyday.
The market is good and halving is there so with 13 bitcoins you can earn good amount of money if you hold it now.