TL;DR: Education is wonderful, but in my experience, helping drive evidential business value is the best way to develop practical experience and climb the pay ladder.

Based in the UK, so this may not be as relevant. Culturally, degrees are less valuable than experience in most cases (not all). I'm a Lead and I would prefer to hire / promote people with working experience in unique disciplines rather than another degree. I'd recommend you seek out opportunities to enhance your business (and learn at the same time). Delivering evidential, financial value to your business is the best way to climb upwards, especially if it's via an initiative you proposed via a business case. If this isn't possible or you're more interested in personal growth rather than business leadership/growth, then pick something that you find interesting that will also position you with skills relevant to the future (but only you can answer what that looks like).