The Shakers had the perfect opportunity to double their 1-0 advantage from the first leg but Phil Jevons' first-half penalty was easily saved by Luke Daniels before Kevin McIntyre levelled matters.
And Knill told the club's official website: "We have to be realistic about everything. They have been fantastic throughout the season, it was one strike.
"They have to get over it, learn from it and move on like we all have to. It's football I'm afraid.
"It's a simple message, we have to regroup for next season and hopefully from this we will be stronger, we don't want to taste what we are feeling now.
"We want to be promoted when the season ends. We don't want to be in the play-offs even though they are good for everyone else. For the management and the players - it's not particularly great fun."