How do I execute Playbooks sequentially for instances not hosts

We have 4 instances on a server and I am passing the sever with --limit. Now I want to execute all the tasks for playbook for each domain

Mentioning serial:1, is executing tasks sequentially for server but not instances.

Please let me know!

Can you share your playbook or a cut-down version of it? It is hard to understand without detail - ansible is very flexible!