[pants2]

I have my Gmail, telegram, and RSS feeds hooked up to GPT-4 to pre-screen for things that are important to notify me about (and might do a summary). Then they pipe to different Slack channels in a personal workspace that have different notification settings. So it's a central place where I can manage all notifications and search/snooze/remind on them.

Otherwise it's all about taking the time to go through the notification settings of each app and customizing to your liking.

Still not great though I don't know a better solution.