One tip: don’t be forever changing up your apps and methods. I write for a living, one or more articles every day, and I used the same text editor (Ulysses) for years until I moved to Obsidian for superior organisation.
It’s more important to have something reliable and consistent, than to be always chasing a better, “more perfect” method or app. Most of us could apply this to our music gear 
At work we use Trello, so I use it to save future article ideas. I have a shortcut on my Mac and iPad that grabs my assigned stories from Trello and makes a text file in Obsidian.
For any non-work reminders, I just use Siri to add a reminder with a date and time.
I also practice inbox zero, more or less. I get a lot of PR pitches, and years ago I stopped feeling guilty about deleting them without replying.
Keep it simple, or you’ll never stick to it.
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