Cross-promotion between separate products?

I have a small tennis blog that sits unmaintained and gets anywhere from 3k - 7k pageviews/month on its articles. It's not much but, I feel like I should make use of it since I don't do anything with the site anymore.

Should I try to funnel traffic to my new web app to get some initial users? I just put up a top banner with a link to the new site for the heck of it.

They're very unrelated - tennis tips blog vs. a memorial page building platform. The web app is geared for use by anyone, but it's still a stretch.

Is this at all worth it or a bad idea?