Good morning Khatmeh!
Thank you so much for feeling comfortable to submit a question. I would definitely recommend trying some more water-based aerobic activities like swimming or water aerobics to substitute some of the Zumba or Tai Chai. When you’re in the water, it helps take a lot of pressure and weight off of your lower back, and it may help subside some of the pain when you are out of the water. Activities in the water are less weight bearing, which could overall help how you feel when you complete strengthening or weight bearing exercises. I would recommend these water-based activities (2-3x/week) in addition to body weight resistance exercises (only using your body weight about 2x/week on days you are not doing any aerobic activity). Hopefully this will help take some of the pain and pressure off of your back.
Please let me know if you have any other questions!
Adeline Farrington