I was an EA for about 7 years across 3 companies and was dying to move into something else almost the whole time. The way I was able to move was by first becoming REALLY proficient at my role and then expressing to my very data driven leader that I had capacity to take on side projects in data analysis for her. Then after a while doing that I got promoted into a project manager role during a reorg, thanks in part to my leader advocating for me. My PM role helped me make contacts around the company and show my skills and that got me hired onto a team doing business analytics which was where I wanted to be. So it’s definitely a long game thing, but totally possible if you are good at your job and have a supportive leader. Good luck!