Drill Down on External Dashboard URL

IS drill down on external dashboards still only available on the Enterprise version? Or is there a way to do this with the starter plan?

By external dashboard, do you mean an embedded dashboard? If so, the only embedding type that allows drill down is interactive embedding which is available in either the Pro or Enterprise plan. See: Interactive embedding

I mean like a public sharing url, not embedding. But that's probably also true for that then.

That's right, unfortunately: Allow export/download from Public Shared dashboard · Issue #6687 · metabase/metabase · GitHub