First, let's be real clear - for almost any search term, Page 3 is the same as non-existent (not trying to be mean).
It sounds to me like you migrated your site onto HubSpot's CMS. When you did this, did you make sure to:
- Inform HubSpots migration team to keep all your title tags, URLs, and content the same
- 301 redirect any changed URLs
- Keep your XML sitemap intact
- Keep your Google and Bing Webmaster Tools verification codes in place
?
There's nothing inherently bad (that I'm aware of) about HubSpot's CMS, but just any website move, problems can occur if you don't go in with your eyes open.
It might be worth having an SEO consultant take a look at your site and offer some feedback. Maybe someone here will do it for free, but most of us are pretty busy with paid work.
Hope this helps.
