i am usually getting more cautious about each bet and make smaller bets when price goes up just to match the price with the risk i take.
This might seem strange but I don't change the size of a minimum bet if the price of Bitcoin goes up. Maybe that is so because my bets are small in general and when I make a bet I really don't care whether it is $0.01 or $0.013. I know that that is a wrong approach though. One bet is nothing, but after 500 bets you'll see the difference. And still I must confess that I valued 1k satoshis when Bitcoin was $250 as much as value 1k sats now.