I think it's hard to differentiate on design fully as a basic CRM. One idea you could look into as both a feature set and a focus of your marketing is leaning into the idea that you're the ideal first CRM and you make migrating to Salesforce dead simple.
You can snag ppl like our company who have been told you'll eventually need to be on Salesforce but aren't ready for all of that overhead. Then once you've got a community of users, you have a chance at adding more and more functionality that will get people to stay with you instead of migrating.
I've always thought there was a market opportunity around that.
Good luck