The Welsh region had beaten the likes of Bath, Toulon and La Rochelle on their way to the European Champions Cup semi-finals but it was a bridge too far against a superb Leinster side.
Having suffered a 38-16 defeat at the Aviva Stadium on Saturday, Pivac is adamant his side will learn from the experience and will be a better team going forward for it.
"We've had a really good run to get where we have done," he said.
"We find ourselves in the top four of Europe so we've made a lot of improvements.
"But we've got to keep improving. The job is not done, clearly, but we'll go away from this and look at the areas we need to improve.
"There's a lot to learn from today's performance. There are some positives to take out of that."