As a fellow Oracle consultant, I see the same. Most of the small clients only involve me in migration projects to other DBs now (postgres or mysql), but the one

As a fellow Oracle consultant, I see the same. Most of the small clients only involve me in migration projects to other DBs now (postgres or mysql), but the ones with >$1M licenses continue to pay their support and migrate to 19c. But that's also because it's way harder to migrate a huge project/organization to a completely different DB - it's just cheaper and less risky to continue with the current one.