A long time ago I was in a similar situation. I didn't have loans and I had about a year of savings, but the hours were crushing me. I spent half of November and all of December grinding to hit my billable hours goal. I hit it, but decided I was working too hard to figure out how to get out. So I made my first ever New Year's resolution; I decided that if I hadn't figured something out in six months, I would just quit without a plan, which is what ended up happening.
I ended up in a completely different career path which I enjoyed quite a bit. I likely didn't make as much as I would have as a lawyer but I did well. I'm now retired. I wouldn't recommend this path with the debt you have, but it's at least something to think about.
I wouldn't be so down on your work. You are not "just making rich people and companies richer." Yes, that is the goal and frequently the effect of what you do. But the other effect is to help creating good and services that provide value to the public at large. You participate in the creation of efficient legal structures to allow things to be created and there's no shame in that.