You answer:

Hi there! I know this is kinda off topic nevertheless I'd figured I'd ask.
Would you be interested in exchanging links or maybe guest writing a blog post or vice-versa?

My website covers a lot of the same topics as yours and I feel we could greatly benefit from each other.
If you happen to be interested feel free to
send me an e-mail. I look forward to hearing from you!
Great blog by the way!