I set up a Notion approval board for one of my clients about 3 months ago and it completely eliminated the back and forth. client gets a simple page with the content or deliverable, two buttons approve or request changes and a comments section if she needs to explain anything. I get a notification, make the change, done. no more "did you see my email?" or "I thought I replied to that" everything is in one place with a clear status. took about an hour to build the first time and I've now duplicated it for two other clients. if you're still doing approvals over email you're making your life so much harder than it needs to be