Yeah, don't forget exp scrolls from GC as mentioned by Kyata.

Making items you've never made before will get you the bonus it's basically double the completion bonus.

What I would personally do if I were leveling without leve's is go to the leve counter. Write down which items are needed for leve's for that tier you're in and I'd make those exclusively. That way people who want to speed level using leve's could buy your items. You'll level and make money. Leve items usually sell fast and for decent money. Just don't be greedy.

I personally don't buy 5k-7k leve items. Not worth that to me. 2500-3k...i'll do. Just my opinion.