Any tips for getting a second wind after lunchtime/in the afternoon?

I get this incredibly bad too.

Stay away from carbs/heavy lunches. That's a big factor.

Something like salad with grilled chicken (oil and vinegar dressing, or I just eat it plain) - I find to be ideal.

Also if I'm dragging I just fricking go hard on coffee at around 2pm.

Also I've found that taking vitamins in the morning helps with my energy levels during the day. (it could be placebo, but w/e it doesn't hurt).

I take a super b complex and D3 every morning.

Then other obvious shit like sleeping well and being a relatively active/healthy person.