For my personal use, I use Notion for all my notes, tasks & other management. (For my agency, we use Asana).
The methodology I use, is called 'Second Brain' by Tiago Forte.
Notion works with linked databases, so you can quickly go from one page to the next.
The first layer are the projects, something with a set end date. An example of a project is "migrate the newsletter"
There's always more tasks you can do than you have time. It's important to have a single overview of all your tasks
If there are too many tasks, there are probably too many open projects. If that's the case, I rebalance my task list by moving projects (and all the tasks linked to it) to a later moment in time.
Doing impactful work, usually starts on a project level - moving that project forward. I use the task view and select that one project to give me focus. I add any tasks that need to happen and break it down into the smallest elements.
Another view of the tasks, I use is the date based overview. It's a simple overview of the time-based tasks I have to do.
Probably the most important database in Notion are my notes. I've been taken notes for years and years and it's been very helpful.
Doing a weekly review, helps me close off a week and reflect on what went well and what can be improved. At the end of the year, I'm re-reading the weekly reviews and write a yearly review.