Hello there,
It’s basically saying that you have elements nested under numerous parent elements, and that you have relatively numerous elements in one page.
“Every ‘element’ displayed on a page whether that be a paragraph, a menu item, an image or the invisible stuff for things like containers and grids all generate HTML. Each one consisting of 1 or more DOM Nodes.”
For instance, the element being reported having a high DOM depth is the text “COVID-19 Took My Waiter Job, Then I Made 5-Figur…” which is under your Thrive leads. You’ll need to address its depth.
Moreover, having more than 800 nodes in a page produces a warning in which case yours exceeds 800. You basically have too many elements in your page.
To put that into perspective – generatepress.com has less then 20.
Here are some recommendations to resolve this: https://www.corewebvitals.io/pagespeed/fix-avoid-excessive-dom-size-lighthouse#:~:text=Workaround%20for%20%27avoid%20excessive%2DDOM%20size%27