I'm pretty happy with https://www.lessannoyingcrm.com/ and have been a customer for several years—they seem to be making a Pinboard-esque "be small and don't die" play, and functionality and support have both been great for $10/month.

I'm not affiliated aside from being a happy customer. And there's plenty of room for more CRMs so I wish OP the best of luck with Micro!