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The BCB is a cricket board rich enough. Yet they are failing to improve their cricket. This is definitely a failure of the management. To improve the Test format, Bangladesh should now organize Test series with weaker teams. Afghanistan is stronger than Bangladesh in the Test format. Bangladesh will not be able to win with Afghanistan. They should play against teams like Ireland and the Netherlands.
Organizing matches with weaker teams will not improve the performance of a team so that it will continue even when they face tough competition. Having a tournament with weak teams means the players can improve their averages and score some big runs but that will not help the team even in the short term against better teams. Find young talents groom them and that is how you improve the format and be a better team.