Agreed, most of the time Sell Similar is going to be more beneficial than Relist.

Did you set your account to holiday mode?

In my experience, it is this setting that seemed to penalise me.

A couple of years ago I was selling on average one item a day. I then hurt my back and had to put my account in holiday mode to stop sales while I recovered. About a week later and I took it off holiday mode, but the following week I only sold one item in total. It took over 6 weeks to return to normal sales.