以往相关经验怎么说英语

"Past related experience" or "prior related experience" are both common ways to describe previous experience that is relevant to a current situation. Here are some examples of how you might use this phrase:
"I have a lot of past related experience working with children, which makes me well-suited for this position as a daycare provider."
"My prior related experience in marketing and sales will be valuable in this new role as a business development manager."
"I've had a lot of experience in customer service, so I'm confident that my past related experience will help me excel in this role."