"The bottom line is you have got to be positive, fit and strong," said Miller. "If you don't do that, you don't deserve promotion at the end of the season.
"It's an interesting division - we thought we were pulling away and starting to make progress yet we lose a couple of games and we're outside the play-offs.
"We are only a few points off, so it is a case of not getting too down-hearted. I think collectively they were on the ball a bit more than us. They worked ever so hard, won their 50-50s, stuck to their game plan and played a really good game.
"It's been disappointing, but we need to keep our heads held high and get back on the training pitch on Monday."