If your CFI is coming up, sign-up and do Jeppessen CFI Renewal program.
https://www.cfirenewalonline.com/. They make it real easy to renew your CFI certificate and keep your original CFI date, plus the information and presentation are awesome, pertinent and up-to-date. I think you can do it up to three months prior t o the expiration date. Don't let it slip though because then it is a checkride to get it re-instated.
Doing this course won't get you ready for that airline interview but it you want to get back in the saddle, this is what I recommend.
Of course there are other courses out there as well, like American Flyers, but I still think that the Jeppessen CFI Renewal program is the best out there.
Good luck,
Jeff
Almost the Speed of Sound Blog (
www.flycrj.com)