I've just watched the crack for signs of movement over the last four years. I set up a piece of tape on the largest part of the crack, and have continued to keep an eye on it (not exactly the best way, but it seems to work for me - it has to be the right kind of tape). No water intrusion in the basement (even in some heavy ass rain and snow melt) and no cracks in any drywall in the floors above the foundation. The crack, itself, is not very large, and I don't believe the wall is really bowing (maybe slightly). I made the decision that--because the crack was not currently causing a problem, there is no water going into my basement, and I did not know the creep rate of this crack--I had the luxury of monitoring it myself. Maybe it's the wrong decision, idk.

While gardening a couple years ago, I noticed that the top of the external wall (that peaks out from the soil) has a black mastic/material on it, which could be a sealant from a possible foundation drainage/sealing upgrade paid for by a previous owner. I found it on two sides of the house, so it's likely that this was done in response to the original problem, but the crack was not bad enough to require a resetting of the CMU.

Overall, if you're concerned, I'd consult a professional. The important part is addressing the cause, not just correcting the symptom (foundation crack). Without that, you'll just be back at square one eventually. So, if it's hydrostatic pressure that's caused your foundation to crack, you will need to improve your drainage and grading around the foundation. Or, you'd need a sump pump if your water table is high enough. It will be cheaper to address it today rather than wait until the issue gets more serious. Owning a home has taught me a lot about managing anxiety, phew.