I'm an engineering consultant for various sales tech startups which operate within the ecosystem of "build a HubSpot/Salesforce/Freshworks/etc integration for a specific type of sales organization". What I would love to see in an open-source CRM is an easy way to bring these integrations directly into the CRM - imagine a `crm.json` file which configures a CRM web app and imports custom code modules from a central repository, similar to `package.json` and NPM.
A big issue end users bring up with Salesforce/HubSpot is the high cost, especially for sales organizations which only need the core features you have in your demo today (track leads, deals, companies, etc) but have to buy a seat for each salesperson. A managed service for a hosted CRM without feature/usage/seat limitations would be an easy sell if you can reliably ingest existing CRM data and provide some level of integrations/customization.