Like many people, I've always hopped between all kinds of various apps to plan my days, and organise things that I learn or find interesting. I've tried Notion, Obsidian, Wunderlist (RIP) and it's direct replacement Microsoft ToDo, Trello, etc. etc.
So I gave up.
I've spent the last 2 months or so carrying around a physical notepad and pen, instead of relying on anything digital, and surprisingly it's worked the best out of any solution I've tried so far!
There's something to be said for having to slow your brain down to commit an idea or note to real paper, and it seems to work for me. It also turns out, the blocks that I believed would stop me from fully committing to an 'analogue' solution weren't actually blocks at all — for example, only having one physical place that notes and ToDos live and no option of syncing between devices (which was overcome by... simply carrying the notebook with me everywhere!). I'm about 80% happy with the current system I've got in place for recording notes, which I'm sure will improve over time — but for the most part, it's been great.
If you're also struggling to deal with the infinite landscape of productivity apps, maybe give the humble notepad a go? It definitely surprised me how well it's worked, and now I can't imagine life without it.