Pursuing PMI-ACP after PMP is valuable if you are looking to advance to Agile project management. It is valid for industries like IT, software, and startups where Agile is in demand. Combining PMP and PMI-ACP boosts versatility; you can become a candidate for all types of jobs and higher salaries as well. PMI-ACP certification is very helpful if your organization is using Agile practices or just transitioning to them. If you already hold other Agile certifications (like CSM), PMI-ACP would not be necessary.