Firstly, make sure you have super sea snails. Next, go to Murch and select add slots or reroll. Then, select a full subbed gear and select reroll. In a few tries you will at least get 2 of the same sub (you can add a 3rd sub of the same ability if you like). Warning: the subs may not be what you had in mind, so if you are looking for specific subs, it’s best to use drink tickets from salmon run.