@Gina
1. Pen and notepad. You dismiss others as stupid when they say this, but in my experience, it's the most effective. Pre-corona, I had to travel to uni on the tube/train/bus, and the notepad was better than any flimsy app.
Very easy to "sync" and keep track, and infinite battery. No need to rely on some big company for storage or authentication.
Technology should be there to help us, not absorb us. I say this as a person who codes. Avoid #bloat!
2. Have one source of truth. Whatever it is (your notepad, a single markdown file you sync across devices, your todos app, emails...), decide wisely and strictly treat it as such. Maybe look into #BuJo.
Similarly, compartmentalise:
http://catb.org/esr/writings/taoup/html/ch01s06.html
---
And learn vim if you haven't already!