The SCJP is kind of garbage in my opinion.
I would become a member of your local java users group - do some networking there and see if anyone is working on any open source projects.
I think a good way to "advance" is to work with a lot of code. An open source project may have several different styles, faux-pas, etc - and it will give you an opportunity to see development in action. It will also give you a psuedo-coding job so you can see what it might be like for real, without having to change careers first.
If you want, I have a project I'm working on - it's not EXACTLY open source, but it's a free service - it's not that I don't want to share the source, it's just a 100% full blown app so not useful to most people.
Anyway, that's my suggestion!
http://rememberit.us/ PM me if you want more info