There are two extensions for HTML Sitemaps in Magento2 that I'm aware of, and they are
Mageplaza free SEO Extension (provides some SEO features including Sitemap)
Mageworx Sitemap extension (paid extension)
Let me know if that solves your problem.
Unlike Magento 1, where HTML sitemap is auto created by default, Magento 2 does not support this feature. Hence, Dynamic HTML Sitemap for Magento 2 was developed by BSSCommerce to provide a detailed sitemap for buyers and store owners.
The module supports:
INSTALL NOW with the help from our Magento experts!
@BSS CommerceI decided to use your module. As expected from one of my favorite agency. The module works great!
I found a free extension which can generate HTML sitemap. This may help you to start.
Give Kudos if it helped or if the problem is solved Accept it as a solution