A lateral raise performed with bands looks like an easy exercise, but it can be challenging. As you lift your arms, the band tension gets "heavier" – a form of accommodating resistance. And overloading the top range of the lateral raise is a great way to trigger new growth.
For fun, combine bands with dumbbells and use a jettison technique: release the bands once you reach failure and continue with just the dumbbells until there's nothing left in the tank.
Learn to apply force quickly and it'll make you stronger. That's what speed training is all about: power, explosiveness, and strength. Try this before you plateau.