How to improve discoverability of unclicked tab?

This is a two-part question. I'm a designer at a health tech company that helps post-op patients track their rehab progress, and we're currently redesigning the site's timeline, which displays the key events in the patient's rehab program. However, a lot of our users are older and less tech-savvy, so there's historically been a huge problem of them not being able to even discover the timeline (see screenshot: it's in the top right tab on the homepage). So first question: Is there a relatively unobtrusive way to make the Timeline tab more noticeable, or direct the user's attention to the Timeline content? Second, and perhaps a bigger question is: does the Timeline even make sense being there in terms of IA? Because while its important content that we want patients to see, it might not make sense on a thematic level to be tabbed next to "To-Do List" on the homepage. Would a card sort be an effective exercise to see how users categorize the timeline? Would really appreciate any feedback you might have, thank you!