Suggestions on how to track personal “todo” items for solo projects, as well as wider “todo” items for team projects ?

Trying to get out of the bad habits of storing everything in my head, and instead capturing the various "todo" items i need to do for solo projects as well as those for group projects.

Pen and paper notebooks have been what i use, but i find i tend to neglect reviewing them and miss things, or cant read my writing! I've played with sticky post-it's or digital equivalents for my desktop , but still not found something that balances the simplicity i need and ease of use. Maybe I just haven't found the right tool. Trying to avoid full blown Jira type setups and webhosted software if i can, as that's just another administration burden that distracts from the capturing of ideas. I'm aware of GTD , but again haven't found a process/tool that i can trust or whose workflow is viable yet. If it is to be a digital tool, it'd be helpful if it could be something i can update/sync to from a PC or Android phone, but would not hold my data hostage if i decided to switch to another tool in the future.

So any thoughts, suggestions, recommendation from others on how they do this ? At the moment its feeling like I'm dropping thoughts/ideas/items because they wont stay in my head…