Site update and what to do about current keyword rank

[juun]

Hi  im in the process of giving my site  a major update as its  only one page and not responsive .

The the new site will have a homepage with a list of my services with a small description of each and each service  will link to its own page.

My one page site at the moment ranks number one in my area for a  low competition keyword (moz keyword score of 13%) of course this sends me very little traffic. With my new site im also going  for  more keywords but these will be Moz KWD 30% and 40%.

I know this will be quite hard and take some time but  i'm pretty sure I know what I need to do to get there.

Now my question is what do i do with my current home page (only page)  that ranks for that low comp keyword?
I dont want to lose my rank for that, so do i make a new page on my new site that is optimized for that keyword, but then I don't want to 301 my homepage to that so I guess as its such an easy word to rank for my new page would soon rank for that?

What are your thoughts and advice please, thanks in advance.

[Linda-Vassily]

It could be that your home page will continue to rank for that keyword (since it is very low competition) if the keyword remains relatively prominent on the page and the meta data.

If this is not the case or not what you want, then yes I would create a new page with appropriate content and link to it from the home page.