If you're crafty, get your employer to pay for those courses. This is a lot harder to do when it once was; I've known people that have gotten their employers to pay for an Ivey MBA.
All the letters after your name won't mean anything unless you can communicate your value to the company every day, not just the interviews. Meaning interpersonal communication, presentations, negotiation and working with others. Can't tell you how many people have a laundry list of certifications, but cannot communicate their ideas or work with others. No offence to you, of course. The common thread is that people with a lot of certifications have only book knowledge, but don't possess the critical thinking or people skills to apply the concepts in the real world. Worse yet, some follow processes by the book and don't leave any room for discussion and are downright hard to work with. You won't get far in the corporate world, if no one wants to work with you.
Learn some sales, marketing, and definitely people skills (interpersonal skills, public speaking, networking, etc.) that you can take to any company or even better start your own. Certifications are fine, but only useful if your company or the one you're jumping to decides to use those processes. Not to mention you have to re-certify every few years. Six sigma and similar certifications are not used everywhere, which can limit where you work. These days you need to worry about which company you're going to work at next, not about the one you're with today.
It takes sales, marketing and people skills to stick around at a company or move around to others. Those skills will never expire, but you still have to work on them constantly.
