Keep Your Apps Updated
If you want the best possible experience on iOS 13.3 you'll want to keep your applications updated.
Developers are pushing out iOS 13 support updates and these should help to stabilize their performance. They'll also help you make a smooth transition from whatever version of iOS you're currently running to iOS 13.3.
Before you download an update for an app, make sure you read reviews from iOS 13 users. These reviews will alert you to potential benefits and problems with the latest version.