Technically, 485J approval is not a thing, even if USCIS has pretended intermittently that it is by approving them at times. They could process your case under EB3 if they wanted, issue RFE asking you to file another 485J for the EB2 job, or pretend that you are now EB2 and do nothing. You could file another 485J, this time for EB2 with a letter requesting that they consider your I-485 under EB3 (TUB letter). Eventually, USCIS has proven time and again that they will do whatever they want at any given point in time, so it's unclear if any of our actions make an iota of difference.
