[1 YoE] Having trouble wording my current job experience to follow the XYZ/STAR method

Hey all, I'm gonna add a couple bullet points that I have underneath my current job description and I was just wondering if you have any input on how I could change it to show more of an "impact" on mine end. I majored in biomedical engineering and this role that I have the bullet points for is a Scentist I role within a biopharm company. When I keep rereading these I feel like I do a good job explaining my "impact", but I have gotten critistism saying I'm not doing a great job. Any examples on how I could reword to maybe hit the STAR/XYZ method would be really helpful!

● Played a key role in successful 2L scale cell performance characterization as part of the Upstream team within Process Characterizations, helping identify critical process parameters parameters and support upstream process decisions—all while maintaining GxP compliance through all lab activities.

●Led a study as the project owner within a designated unit operation for 2L cell culture. Oversaw all phases of execution, coordinated multiple cell culture runs, and ensured alignment with business objectives and project timelines.

●Applied statistical tools (e.g. JMP Pro, Minitab, and DesignExpert) to design experiments, analyze data and identify trends—utilizing techniques such as linear regression and hypothesis testing to optimize study outcomes.