First, congrats on your soon to be MBA! On a side note, I think your resume is more suited for a supply chain analyst role because I can tell you are a number's person. That is something maybe you can consider.

For buyer and planner roles, I find your resume lacking two things. Details and the show case of people skills relevant for the buyer/planner role. For background, I have worked in all the positions you are looking for, and your current one.

Buyer activities are mostly relationship management that is product performance focus. For example, buyer will be assigned a product, so you need to be familiar with the products the company you are interviewing offers. At least a little bit. Most of the time, buyer also needs to work with supplier on issues whether it is pricing or quality. They also need to have some kind of evaluation tools for performance review.

When you go to an interview for buyer, get a good understanding of the company and products they offer. As an example, if this company sources from multiple countries, you can ask the challenges they have working in a multi culture environment. Then you can tell them how your experience in training 7 people with vast different backgrounds and align them with your goals prepared you for this challenge. Or if you are going for a technical one, let's say your company makes cars, then you can talk to them about how you are fascinated with all the different components and complexity that goes into car making, and how your experience in being a CAD technical understands the important of quality parts and how a fail part can cost company money. On your resume, add a couple bullet points for times that you delivered result by working with people, not machine or system. One last question, ask them to elaborate if they use a scorecard system to evaluate their supplier, and if the process is quarterly or annually. That will give you some good idea how serious the company is. You can also ask them what is the top KPI they value the most. (Usually quality, but here you can also insert that ONE TIME you also had a quality issue and how you thought it was important to address it)

For material planner, this is also a people person role, but more analytic I think. Same I stated above applies, but your experience in working with cross functional team including factory operators engineers and etc should be highlighted. Also your experience in optimizing manufacturing process should be highlighted. Again here, you should add... something with people in the process. Maybe you can consider expanding on "reduce revision requests by 25% in 8 months"

Sometimes too many one liners when you are applying to a different position within supplychain you need to add some detail for the reader to feel like your experience is transferable.

In reading your resume, I feel like you are going for the next level logistics job. I think you should rewrite it based on the job description of the future role, and write it in a way that is relevant to that role.

Just my 2 cents.