In your case I would create a second site. Let's talk. I might have some ideas for you.
Of course that's what you'd do!
Follow along with the video below to see how to install our site as a web app on your home screen.
Note: This feature may not be available in some browsers.
In your case I would create a second site. Let's talk. I might have some ideas for you.
You have a very strong site that is performing well for some tough to get keywords.. That will be difficult to duplicate.. I would try to incorporate some of the new lines of business into your current site... Google looks at your site as a whole but the rankings for each page.. It will be much easier to rank a blog post or page from this site than starting fresh..
Create some new categories for those lines of business and set up a silo structure for them.
BruceClay - SEO Silos - how to build a website silo architecture