Honestly, the only thing that has helped my low back has been improving my hip mobility, improving my lower body flexibility (hips, hamstrings, glutes, etc.), and foam rolling.
Other stuff has helped with day to day pain. Like ice, heat, contrast showers, and I've got an old STEM machine I'll use if it really starts bugging me. But, the only thing that's helped keep it away is doing the stuff above (stretching, hip mobility, foam rolling) on a consistent basis.