Don't re-grout - re-colour
Having washed down the tiles with a bleach based product the grout lost a lot of it's colour in patches. Applying the grout pen restored the colour and it now looks uniform. I don't suggest a complete change of colour unless you intend to go darker. Easy to use, do a small area at a time and wash off excess immediately, If you have allowed to dry it is removable but with extra effort.
Nibs wear out quickly so try cutting a short section to put in as a spacer when they've all worn short and use more carefully with the remaining nibs pushed in on top, Use rubber or plastic gloves for this unless you want to join the Black Hand (other colours are available) Gang for a few days.
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