I think there are apps to set price alerts on crypto. Not saying you have to use them for purchasing but maybe just for the alerts.
I use Uphold as well. Was up feeding baby 1am when I saw BTC taking off and XRP was still just under 0.30. Took that opportunity to buy a little more. If this %gain holds then I got lucky. Crypto is 24/7. Unfortunately we are asleep for part of day and big movements can happen on the other side of world.