Put in your apps to the other regionals you might prefer but delay your class start date until after your off probation (typically 6 months) ar your current regional. That makes it clear to future employers that you weren’t let go or allowed to “voluntarily” resign in lieu of termination and keeps your record pristine. At the same time, you don)t really lose much, because you are likely at least three months away from class date anywhere you might apply today, just because it will take them that long to do the PRIA and other checks.
So all you are really doing is giving up about three months seniority - not a huge deal in the grand scheme of things - and it buys you another six months to see if you will feel different about your current regional once you are holding a line.
If you can’t hold a line after one year, or if you still are getting trivial amounts of flying, no future employer is going to look askance at you if you explain you changed regionals because you wanted to fly rather than sit. Most will look at that as a plus, as long as they are sure that your move was voluntary and you gave the first regional a fair shot.