Noone here is going to be able to give you a definitive answer to your question because every server is different. It is up to you to do some research and discover what is most profitable.
- On some servers you can simply gather Cat herbs and mines to riches but on many they have been driven down due to competition - but WoLK herbs and ores are often very profitable on those same servers since they are often overlooked.
- You have a max level Alchemist and Engineer... what spec is your Alchy? What recipes do you have for that and Engineering? Some of them can be profitable, but you have to take the time to look at your AH or TUJ (theunderminejournal.com).
- Enchanting can be VERY profitable if you or the previous owner take the time to get the enchants and then get the mats and create the scrolls... Also disenchanting can be VERY profitable as well.
- Leveling up an Inscriptionist can be profitable on some servers - darkmoon cards, fortune cookies, glyphs (ugh... on most servers these are competed into the ground - BUT keep in mind that if you are 'getting your herbs for free', that you can still profit while those that are buying their herbs would be losing gold)...
Again, the shoe is on your foot. We can only point you in the direction of where to look, but it's up to you to find what is actually profitable on your server.