I think the best thing for back pain is to get stronger. A stronger back will be just that, stronger, and less susceptible to injury. People with back pain shy away from exercises like deadlifts when that is what they really need to be doing.
I really wouldn't even bother with stretching, it hasn't really be shown to heal or prevent injuries but it might feel good. If you enjoy doing it then have at it but it probably won't be that useful, especially compared to strength training.
I'd also caution against imaging. Lots of asymptomatic people have bulging discs when imaged and it's not actually an issue. After seeing it on the imaging they nocebo themselves into thinking they have an issue though. It's similar to a meniscus tear. A whole lot of people have a tear in their meniscus but have no clue. If they get an MRI and find out, they likely will start experiencing knee issues when nothing has changed except their perception.
Chiros and PTs are mostly a waste of time unless they focus on strength training. Most chiros are complete quacks with no meaningful training and most PTs don't utilize an evidence based approach.
Here's a good article about an approach to back pain:
Navigating Potholes: My Back Pain Experience
And for when you are strengthening your back, this is one of the best articles you can have in your back pocket. Training with an injury is not nearly as complex as people make it out to be but at the same time, it's important to take an intelligent approach. The key is finding an entry point where you can still elicit a training stimulus but without causing more pain. Then you can start to add to that as you're able, eventually back to full strength.
Pain In Training: What Do?
I have dealt with a myriad of injuries over the years, hip, knee, elbow, and wrist being the majority and when I started taking the approach of the articles above I have been in the least amount of pain for most of my adult life. I used to stretch for around an hour a day and do all sorts of "corrective" exercises I either got from a physical therapist or found online and now I just focus on getting stronger with intelligent progression, while adjusting my routine (but not resting) if I tweak something.