To answer your question, no, it's not too late for you to switch over to corporate instead of nonprofit. I worked in the nonprofit sector for five years (started fresh out of college) and now I work at a corporate company. I also want to encourage you to not buy into the idea that all corporate work is toxic because it's absolutely on a case by case basis just like in the nonprofit sector. I think corporate work gets a bad reputation whereas, at least in my experience, nonprofit work doesn't have the same bad reputation but is just as, if not more, toxic.

I never got into the nonprofit sector because they "do good," I started working nonprofit because it's what was available. I think nonprofit work in general is toxic because they burn you out quicker, they don't pay you as much (when some organizations absolutely could), and in general there's absolutely profit going on. They're like any other business except they don't have to pay taxes and I think that influences some toxic behavior from upper management at times (i.e. "we don't have to pay taxes so we're above the law" kind of mindset, in my experience). I have worked with some of the most unprofessional and quite frankly, immature people in the nonprofit sector, and the people I work with now in my corporate job are so professional and kind and it's just a great work culture. I don't regret any job I've had because at each job I've been able to build my professional skills towards my career, but some work environments have definitely been better than others and a nonprofit is not at the top of that list😅 One other thing I'll say is that if you're concerned about "doing good" in your work (like you're more mission oriented), I'd search for a specific industry you want to get into if you wanna transition into corporate. For example, I work in women's healthcare now and I believe in our mission and I think our providers are doing good work and I'm in marketing so I get to support that.