What to keep, what to lose.
Your resume is an advertisement. A very specific tool to show a prospective employer you should be invited for an interview.
It is not your biography of everything you have done in your life. Too many resumes fail for this reason, my own included.
Take a few minutes, see what you should unpack, repack, and create a resume that shows your skills, your experiences, and why you are the best person to be hired.