Back in September 2015 when I was unexpectedly confronted with a possible new job, I had to cobble together a resume and portfolio. I hadn't made a resume or filled out a job application since December 2005. I thought I would be at the job I had forever. A lot had happened in those 10 years. I hadn't kept my own list of accomplishments. Ever. 2005 was before I ever did anything in the Cloud, so I no longer had anything from 2005. I had to request a copy of my application and resume from my employee file so I could remember info from previous jobs.
All this is to say, you never know when an opportunity is going come your way for something, so keep track of the things you have accomplished. I started doing this immediately in September 2015 when I realized I had forgotten so many things I had done and the specifics about them.
Maybe you're a stay at home parent. Record when you were PTA treasurer or organized that school or neighborhood event. Maybe you volunteered at the local library shelving books or reading to kids. Record it. Maybe you coached a little league team or soccer team. Record it. I've hired return to work parents over recent college graduates many times over the last 25 years. As a manager, I love return to work parents who have a track record of organizing school events or fundraisers. LOVE.
Or maybe you have been in the workforce for a long time and have simply forgotten about everything you have accomplished. I know when I have worked on big things at work and they finally get finished, I am eager to move on to something new. Many of us are not good at celebrating our own work. RECORD IT.
Every time I complete something of significance at work I add it to my list and include some specifics. It only takes a minute or two. I never know when another opportunity will come my way. And truthfully, when I've had an exceptionally hard day or week at work, I pull up my list and look it over as a reminder I am very capable of accomplishing things.