I'll just say you are in a very good position for now to advance your skills to the max.

Your in a place that needs some renovation and your the chosen one to do it.

1st Phase:
Doing an survey on what can be implemented to improve the work environment.
From what you have listed the first thing I would recommend is setting up Git on your machines to implement modern version control. Then setup a testing, staging and testing environment. You can then setup an integration server and run ColdFusion tests in the staging environment before you deploy your code to production. This will add development, automated continuous code integration and source control management to your resume.

2nd Phase:
Setup a ticket system for all requests for bugs, features, etc. to be funneled through to decrease email support.

3rd Phase:
Build analytics into the system, first start out with setting up monitoring for the web and database servers. If you only have one web server create a new server to put the database on to enhance security. Have the database server only accessible internally. Then duplicate the same to your staging and testing environments. This will help increase security of the overall infrastructure if this is not done already. For you this will allow you to add designed secure muli-tiered server infrastructure, infrastructure monitoring and analytics.

4th Phase:
I am not sure if you are able to change what your running as a server side language from Cold Fusion if not I recommend that you master Coldfusion, also not sure what version of Coldfusion you are running but if it is the enterprise edition there is a nice bit for you to learn.

If you are able to change the language I would recommend doing a survey to see what features you currently have in the site and then choose a language that you can migrate the system too and get industry certifications to help you become more marketable.

If you choose Java you can get certified in Java SE, Java EE, 11g,12c, etc. use this until you get all the way up to expert level for each cert if possible. If you do not see this as a route due too the required class costs you can choose an alternative from a highly demanded programming language or framework like Ruby, Ruby on Rails, Python, Django, C#, ASP.NET MVC, NodeJS, Go, Closure, ClosureScript, Scala, Dart, etc. Then setup the frontend in AngularJS and create a WebAPI to interface with the website.

5th Phase:
After you have a strong site setup you can use the API to interface with mobile applications you create for iOS and Android to add both to your resume. I

This should help you add some meat to your resume and if your going to be working somewhere for 8 hours a day you might as well make it work for you and get your experience and certifications. Check with your manager, admissions and HR to see if there are any opportunities for you to get a B.S. in Computer Science fully paid. You might even be able to move up the ranks over time to higher positions within the company or start your own consulting company.

I am also sure you probably see a nice bit of variation of people at work. Get to know them go out to eat from time to time. They might be a very good contact or business associate for you in the future. You could become friends with the next Mark Zuckerberg or become the next Mark Zuckerberg and might need some college buddies to help you get things started up.

Once you have done what you feel has fulfilled you there it will then be time to spread your wings and fly to a new job. If you can get the B.S. in Computer Science degree that would be nice but don't let that hold you back.