A new tool never costs $20 a month. It costs the 40 hours you spend learning it, the 2 weeks of moving your work into it, and the workflow that breaks when you leave the old one behind. The subscription is the cheapest part of the bill, and it's the only part anyone advertises.
Run the math before you switch. A tool that saves you 10 minutes a day but takes 30 hours to learn pays you back sometime in month 4, if you're still using it by then. Most people aren't. The graveyard of half-adopted apps in your dock is not a discipline problem, it's an arithmetic problem.
So the rule: before you buy anything, wire what you already have into each other. Your notes into your assistant, your calendar into your booking page, your docs into the agent that reads them. Most "I need a new tool" problems are really "my tools don't talk" problems. Connect them first, then see what's actually missing.