Cullen and co were beaten 26-16 by Toulouse in last weekend's Heineken Cup semi-final as they saw their reign as European Champions come to a frustrating end.
But with Leinster currently sitting at the top of the Magners League standings and a Play-Off place already secured, Cullen is determined to see the Dubliners' season end on an almighty high.
"It would be sad if we didn't come away with anything from this season because we've put a lot of work in," said Cullen, who is expected to lead his side against Edinburgh at the RDS in the final game of the regular season this weekend.
"We've got to see how we react to such a big loss and there is still plenty to play for.
"We've got a game against Edinburgh and we need to try and secure a home semi-final and push on from there.
"There are potentially three games left this season and we want to win all of them."
Leinster are three points clear the top of the table, with anything other than defeat to Edinburgh set to guarantee them a home semi-final on the weekend of May 14/15/16 courtesy of a first-place finish.
A sixth loss of the league season won't prevent them from participating in the Play-Offs but it could see them lose home advantage.
Both the Ospreys and Glasgow Warriors could yet overtake Leinster on the final weekend.
A victory for the Ospreys at home to the Dragons would see them move into top spot if Leinster lose to Edinburgh, while a bonus-point triumph for Glasgow at the Scarlets would see them overtake Leinster if Michael Cheika's men fail to pick up a single point on Sunday evening.
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