Hey there! First of all, don't be discouraged—you're absolutely not alone in feeling this way. It's great that you're taking the step to experiment with a Pro subscription and see how it affects your visibility but I don''t think its needed, it is however great for the tutorials and other features.
While it can be frustrating when things don't seem to improve right away, it's important to remember that growth and engagement on platforms like ArtStation can be built over time. Think of ArtStation as an end platform that all your vectors of dissemination point to.
For example you post on Linkedin, Polycount, Discord, Unreal Forum, Twitter and so on, then mention if you would like to see more go check out this link that's a natural way of build up views.
- https://www.artstation.com/artwork/18BQ33
Also don't worry about views and likes. It's what's in your ArtStation when you apply for a job is what matters, no one is going to care about your view count or how many people like your artwork, they just want to see good work that is built in the correct way.