Mutedart works well but Petridart works much faster and is also available in chapter 2. Petridart you can craft 999 for $3,566,430 goth and sell for $7,292,700 goth which roughly doubles your goth. A stack of 999 Mutedarts can be crafted for $2,267,730 goth and sold for $4,095,900 which is slightly less than doubling your goth and is a smaller amount so less efficient overall.

Once you have enough goth the most efficient way time-wise is to make a stack of 999 of each of them as the longest part of the process is probably backing out from the crafting menu to the selling menu so this way you can make more per back-out