Can I see your body of work?

Are you leaving behind an easily found trail of accomplishment?
Few people are interested in your resume any more. Plenty are interested in what you've done.
The second thing you'll need to do is regularly note what you produce in a log or find some other way to keep track.
The first thing is more difficult: If the work you do isn't worth collating and highlighting, you probably need to be doing better work.