For this to feel more like a training material, I think there should be some questions and/or exercises stated under each session/section.
For example, it could be consolidation questions at the bottom of a section for a learner to check their understanding,
and/or a concrete task/exercise to complete.
In some cases there are exercises, but they are not given much prominence and are easy to miss (especially those hidden in tabs). As a learner, I would look for objectives and tasks first, and then use the information to achieve them...whereas we're currently assuming learners execute training materials top to bottom like a computer does!
Solution: Have an 'Exercises' section under each section, at the bottom, which is very clear.