Is retention an issue for your courses? How are you handling it?

Hey guys, I'm Pau from Argentina.
I've been working in education my whole career (mostly edtech companies) and recently joined my cofounder in a new business, palabra.io

Since I love everything related to education, I'd love to test our tool in online courses. But first I need some insights from the community:

How important is retention for you today?
What are you doing to improve engagement in your online courses?
Would you be interested in learning about some engagement strategies?

Any thoughts or feedback will be greatly appreciated <3