Switch from TZ to Reta

I have been on TZ since 2023, initial year lost 80 lbs, went to maintenance and gained back 20. Upped my maintenance and now up to 5mg every 4 days, I have zero side effects and wonder if I just have turned into non responder? Would Reta be the same or with the extra agonist would it get me losing again? I also did not work out on my initial lost, but lift heavy 5 days a week so have improved muscle greatly, not body builder but definitely added some of that weight in muscle