A "barren period" refers to a period of time where there is no growth, development, or productivity. It implies a lack of success or progress during that time. Full definition
The 1970s and 1980s were a relatively barren period for Manchester United. (manutdnetwork.com)
The Frenchman is by no means an inconsistent player, but his best moments have often been sandwiched between barren periods and usually do not reveal themselves in Atlético's biggest games. (intothecalderon.com)
Blackpool are of a similar mould and are very much capable of going the same way if they're not careful, with the only thing stopping them from plummeting down the table at present being that the novelty of the Premier League has shown no signs whatsoever of wearing off with the fans now the players, but the team has also gone the entire season to date without enduring a really barren period. (football-bookmakers.com)