Time Travelling Idea

I might make something out of boredom from spring beam about being transported into ancient times. I always lived time travel novels and watching Dr.Stone and Groundhog Day it makes me think about what if a Bio engineer was transported into the past? I aspire to be a bio engineer myself but I feel like if a modern bio engineer were transported to the past they could definitely make society just a lot better. Oh and they’ll be forced to be immortal, that’s kind of a given. You don’t really expect to live long in such primitive worlds.. I’ll pick up and work on the idea in maybe a day or something.