Need help picking new template to better serve mobile devices

Hey guys. A quick rundown. I've been using Zencart for almost ten years now (!! Just realizing it's been that long !!) and I saw constant growth over the first seven years but the last three have been very very rough. I chalked it up to the Google Products listings no longer being free. Most of my traffic came from the Google listings. I mistakenly thought that I would no longer be able to list my products with Google Base but last year figured out that I still could and that it wasn't very expensive. This helped a bit but my sales are still way down. I've been pretty lazy about things and just filled the orders as they came in and enjoyed my time off.

Today I took a look at my Google Analytics and I think I'm pretty sure I see the problem. I've found that over half of my customers are using mobile devices and my site is definitely not mobile optimized.

Can someone suggest a quality mobile optimized template? I'm really at a lost when it comes to finding a good template and would appreciate any advice. Thanks

Here's my site for reference

http://www.decaldepot.net

Here is a full list of responsive designs, most have demos on the developers site.
http://www.zen-cart.com/downloads.php?do=cat&id=2

dinki:

Hey guys. A quick rundown. I've been using Zencart for almost ten years now (!! Just realizing it's been that long !!) and I saw constant growth over the first seven years but the last three have been very very rough. I chalked it up to the Google Products listings no longer being free. Most of my traffic came from the Google listings. I mistakenly thought that I would no longer be able to list my products with Google Base but last year figured out that I still could and that it wasn't very expensive. This helped a bit but my sales are still way down. I've been pretty lazy about things and just filled the orders as they came in and enjoyed my time off.

Today I took a look at my Google Analytics and I think I'm pretty sure I see the problem. I've found that over half of my customers are using mobile devices and my site is definitely not mobile optimized.

Can someone suggest a quality mobile optimized template? I'm really at a lost when it comes to finding a good template and would appreciate any advice. Thanks

Here's my site for reference

http://www.decaldepot.net

I only have one thing to add to bislewl's post..

STAY FAR FAR AWAY from Theme Forrest and Template Monstrosity templates!!!!

Thank you both for the help.