[geoffchan23]

If you're looking to be valuable in the job market then my advice would be to focus on fundamentals and soft skills. If you're more interested in changing what you work on day to day then I think you need to apply elsewhere. It's really hard to change the stack of legacy software and often doesn't make business sense. Even when there is a lot of value in upgrading, you will need to convince people that may not necessarily agree.

What has worked for me is to move to what has made me MOSTLY happy. It's rare that you will find a perfect situation.