How to get a better return on cash in 401K account?

Hi,

My stock broker only offer 0.01% interest for the cash balance. That's a lot lower than my bank that offers 3%. I have a cash position in my self managed 401K plan which is not an employer plan. I could move it around anyway I see fit. However I cannot move it out of the 401K account without getting a penalty because it's a retirement account (have to wait until 59.5 years old). I wonder if there is a way to make a better return than 0.01%. Please share your thoughts. Thanks.