Logitech G733 Wireless Headset Fix a Loose Headband Strap

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The first step is to fold the headband strap so it loses some length, also accounting for extra length in the future. Pick somewhere on the left or right side so you dont feel the fold as much on your head
Remember that there are 3 different combinations to put the strap on your head, so you can start with the headband loose (bottom rungs) and then go up a rung as the headband expands again.
Personally I've used between 1.5cm-2cm folds.

Backstitch using some thread and a sewing needle! I chose purple thread as it matches my headphones
I'm no sewing expert so I'd personally suggest looking at some online tutorial images to show you how to get the nice backstitch.
If your needle at any point snags onto some white elastic on the inside of the band, carefully try and unsnag it and try to put the needle back through without moving it again. You might find giving the band a stretch helps putting it back.
As you can see the backside doesn't need to be neat..