Children of Bodom's first world tour began in 2003 and lasted until late 2004. The tour had many sold-out concerts and marked the consolidation of the band in North America, but was also accompanied by an unexpected announcement: Kuoppala decided to quit Children of Bodom for personal reasons right in the middle of the tour. Laiho's bandmate from Sinergy, Roope Latvala assumed the guitars as a session player, until later joining the band as Kuoppala's replacement.[citation needed]
In 2017, Kuoppala joined Finnish metal band Valonkantajat and recorded sologuitars on their last album "Vastavirtaan" in 2018. He played in Valonkantajat until 2021 when the band split up.
In 2019, he formed new band called Thyrargo. They started to record their first EP in 2020.