Advantage of using InMotion vs. WordPress Itself?

I am curious the advantage of using a pay-for InMotion as a host versus using WordPress itself as a free hosting site (since I noticed one of your platforms for web creation is WordPress)? I signed up for InMotion hosting a few days ago. I actually created a website through WordPress a few years ago (it’s still active), but I thought a new site through a hosting agency would be/look more professional. However, it was recommended to me to actually use WordPress for designing my new website (which seems counterintuitive to just using WordPress itself as a hosting site, and simply updating my old one). I am a very novice/beginner at website development and don’t plan on getting too experienced, as I am only creating my own site due to the cost of outsourcing (i.e. so my site will always remain simple, not using, or aware of, many of the functionalities you may offer). I would rather spend my time creating what I am selling on my site than creating the site I’ll be showcasing it on.

So please advise what advantage(s) InMotion offers over simply continuing to host through a free WordPress site, which I already have up and running? My website I am using is to showcase my abstract paintings, so much more visual than written content.

-Ryan