Now What????

After millions of gil and far, far too much time, I've actually taken every craft to 60 except fishing (lol fishing). However, I can only take one to 100. What should it be??? Or should I do a mix in several to maximize fun and profit?

Note, cooking isn't an option since I have access to a 2nd acct that already has it at 100+3. Further, I have friends that have 100 in each craft, several friends for each craft in some cases, so I have resources to help me level as needed (for example, I could find a woodworker to make staves or a goldsmither to cut gems).

So given I want to be the "most" useful to my shell (I run an endgame shell on Valefor), most profitable for my own needs, etc., what should I do?

Smithing or Leather

Not much money in leather anymore. only thing you make money on easily is the normal leather itself. if you farm the hides.

but yes better to take a craft to 100 than 2 to 80

Could learn the fundamental usages of a question mark, and how to use less of them.

If you have 100+3 cooking on another character, I hate to say it but fishing kind of goes hand in hand with that. It's a waste of getting all crafts to 60 though.

I would suggest Smithing. You can make a lot of oft-used items and its second in profitability only to goldsmithing. Then I would also suggest you take a mule to 100 fishing if you want to make the most out of your cooking.