15 years cobol experience but out for last 11 years. How can I get back in

I worked as a Cobol Mainframe contractor for around 15 years in Australia and overseas, mostly in the banking industry with a little in telcos. I did what most Cobol workers do… cut code, analysis, testing in all phases of the life cycle, migration etc
I then left the industry around 11 years ago.
I’d like to get back into I.T again but don’t quite know to approach it. I believe I can pick everything up again quite quickly but I doubt employers would be interested in employing me with such a long break.

I’m wondering if anyone has any advice on how to tackle this…

Thanks a lot