If you look pre-Covid, you'll see that the trend line goes back to 2020. Various reasons for the flatter line:

• Retirement. A lot of boomers are hitting retirement age and there aren't enough zoomers to fill the void.
• Interest rates. Inflationary policies due to Covid have made money cost more. This has lead to previous economic growth strategies no longer becoming tenable.
• Tech collapse. The tech sector in the USA has hit the right side of the S-curve for a lot of different technologies. This has limited growth of one of the major engines of the American economy.
• Remote work. Better remote work tools have allowed people to work wherever. Along with this, companies can hire people from a larger geographic area to perform tasks. A lot of hiring is happening in lower cost of living areas, including outside the USA.
• Gig economy. More people are relying on the gig economy to make ends meet. These are not full time roles, so they aren't counted here.