Domain Change

I recently restructured my website https://www.imreviewpro.com in order to do a less is more approach. I have not begun a earnest traffic generating campaign so my visitors are not many. I changed the site title from the domain name to the focus and keywords for my site. My question is can I change the domain name to something closer to my content and if so what are the up and downsides and if I choose to do it how do I do it without subdomaining