You could use noindex or nofollow, but that's kind of shooting yourself in the foot. There's no reason to not have your contact us page indexed.
If you want Google to focus on your index page, find out why it's not getting ranking in the first place.
Study your contact us page and see why it's ranking so well for your given keyword.
Study your index page and see what's not working. Check your keyword density, page structure, number and quality of backlinks, etc.
It would be easier if you would post the link to your site.
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