Focus on the transferrable skills and results of your past positions. You may need to rethink what is relevant and no longer relevant on your resume. To do this, you may need to research a few target job posters and assess what are the common qualifications they are looking for. Sometimes, you may have most of the qualifications they are looking for. It also helps to speak to the magnitude of the work that you did. eg: The industries that you worked with, the amount of people that you worked with, and $ amount.

A good technique is to have a "dump resume". This is where you brainstorm everything you did and your results. Do not worry about the page limit. Once you are done, then you copy and paste the relevant parts into your good copy.

In your cover letter, you should speak to why you want to switch careers. This way, they will know that you intentionally are making a change in career and aren't leaving wondering if you would go back.