Do you manage your own 401K or do you just put money into a target retirement date that is setup for you?
I'm a little older (almost 35) and I used to just go with the target retirement date and my earnings were real slow. A couple years ago and started picking what I wanted my 401K invested in and my earnings have jumped. Back on 11/29/16 I had 55K. Just looked at my 401K today and it's 74K. Gone up 20K in a year and a few months. Also does your company match your contributions? If you can slowly add 1 or 2 % more of your paycheck to your 401K. It's not much, but you don't notice the loss in your paycheck and it helps your 401K grow.
All the 401K brehs. Are you doing regular 401K or Roth?
Yeah, mine was 21k last year. Just check now and it's $31k
I've never made any changes to the funds I'm in. It seems to be the right mix, considering my age. I'll look into it though.

(we’re all doomed)