There's a number of specialist paths you can take. I think the most profitable ones right now are *Nix administration, and cloud administration, whether that's

There's a number of specialist paths you can take. I think the most profitable ones right now are *Nix administration, and cloud administration, whether that's public or private clouds. I think the cloud administration might mesh nicely with your web application support knowledge. You can get into BaR administration, or storage administration. Bigger companies need storage, and they'll need backups. Data is exploding at a huge rate. If you like coding, you could transition to DevOps. Another option is management, but please don't pursue this unless you know you want to do it.