It would depend on your territory - so check your job sites - but for me in the UK. I have seen a total of 0 jobs ever for RH Virtualization. Thats 0 out of 1000's of roles.
Not only that the EX318 is seen as a real soft touch.
Advanced Automation would be a logical extension of your EX407
Cloudforms would be reasonable given your focus on cloud (but it's a soft touch too)
I wouldn't bother with RHEV. That being said, it's a very capable virtualisation technology and I actually like it - but the market where I live doesn't agree with me.
I wouldn't bother with RHV, either - it has very little market penetration & Cloud-Native Virtualization in OpenShift is the future in that area.
I have the hybrid cloud cert because it was relevant for me, but CloudForms isn't that popular, either, and it's fate seems uncertain. Personally, I would go for the Advanced Automation (and will myself next year).