In order to work around this you will have to start over with that same archetype and sim until the start of your second season in the majors. Do not come out of the calendar or it will kick you. When you get to spring training going into your second year make sure you hit sim spring training and not advance to regular season or it will kick you. Just keep simulating and eventually you’ll talk to the manager and he’ll ask you if you want to stay a two way player or become just a starting pitcher. Hope this helps. Just in case you mess up I would save as soon as you get called up to the majors under a new save file.