401(k) is flatlining

New to the US and still learning. I’ve got a 401(k) with employer matching, I love it and I think I can max it out. But I have realized that the investment only grows by contributions.

I didn’t find much info on the fund, it’s BlackRock LifePath® Index 2040 Unitized Account M.
Currently priced at $10.37. The price has been around $10 all the year.

Other funds I can choose are these:

What can I do to get more growth in my 401(k)?