If I understand correctly, you are selling a B2B version of something where B2C options exist? In that case, suggestions:
- More sophisticated logins: Google/etc.
- Integrations
- Attestations (e.g. HIPAA compliance etc.)
- Team management functionality
- APIs
- Audit trails
- Offline communications & support. I'll add payment via invoice here. I have onboarded Enterprise customers who only needed Enterprise pricing because they needed to bay by check, and/or they wanted a phone number to call for help (which they tended to not use often).
I will say that if your market is well-covered in B2C offerings, you may want to either niche down further by adding core features businesses need. For example, can you help them enforce some kind of corporate standard (possibly via workflow)?
Or you may want to get into a different market altogether.