My rationale is since my site was poorly received, it will be better to get a clean state. There are many instances of bad user experience with the current site, related to slow loading and unresponsiveness. A new update is on the way that basically fixes all those concerns. The site is almost a year old and has less than 200 visits. The new version is way more performant so should I stick with the old domain name or get a new one for the update?
I think that the content has more to do with this than the domain name.
Quote from John Mueller -
Finally, in 2020, Google Webmaster Trends Analyst John Mueller revealed keywords in domain names no longer play a role in determining search engine results rankings.
Answering a question if keywords in domain names impact rankings during an Ask Google Webmasters video, he said, “In short, no. You don’t get a special bonus like that from having a keyword in your top-level domain.”
Does domain name affect Google search?
The domain extension, commonly referred to as the Top-Level Domain (TLD), generally isn’t considered a Google ranking factor, except in the area of International SEO. In this case, having a specific country code top-level domains (ccTLDs) can indicate to search engines which country your content is targeted at.