I would recommend you get started on a back exercise program. Go to a PT to help you get started.
Apart from that you can try MSM and glucosamine that is said to help arthritis if it’s not too bad. They haven’t helped me, but mine is bad. For the pain I take White Willow Bark which is where aspirin was developed from and is a mild pain killer and an anti-inflammatory.
MSM and glucosamineare are natural supplements, White Willow Bark I would classify as a drug but with fewer side effects the aspirin.