I can't tell what level your BSM is because Lodestone won't show it for some reason, but I'm pretty sure I did leves focusing on quality synths until I got to 28, then spammed cobalt ingots. Granted, I had a lot of cobalt on hand from grinding out a bunch before they changed it to where you could only gather one. I'm not sure if it's worthwhile to craft ingots to sell if you have to buy the cobalt.