I’m 69 and worked for the same company for 45 years. I only have $121,000 in my 401(k). How can I repair this damage?

I’m 69 and worked for the same company for 45 years. I only have $121,000 in my 401(k). How can I repair this damage?
“I plan to work and contribute to a 401(k) in addition to a stock-purchasing plan for a few more years.”