[5] His first coach in Prague was Jakub Štrobl before eventually switching to Michal Matloch prior to the 2019–20 figure skating season.

[1] Prior to the season, it was announced that while continuing to work with Michal Matloch in Prague, Reshtenko would also make trips to St. Petersburg, Russia to be trained by former coach, Roman Usatov.

[1] In February, following the Russian invasion of Ukraine, Reshtenko would end his working relationship with Usatov and stop training in Russia at the request of the Czech Figure Skating Association.

[5] Selected to represent the Czech Republic at the 2022 World Junior Championships in Tallinn, Estonia, Reshtenko would finish eleventh overall.

Selected to compete at the 2023 European Championships in Espoo, Finland, Reshtenko would place twenty-sixth in the short program and fail to advance to the free skate segment.

He would also go on to compete at the 2023 World Championships in Saitama, Japan, placing thirty-fourth in the short program and failing to qualify for the free skate segment.

Subsequently competing on the 2023–24 ISU Challenger Series, he placed ninth at the 2023 Lombardia Trophy and while he did complete his short program, he withdrew before the free skate.

[1] Selected to compete at the 2024 World Championships, Reshtenko place thirty-sixth in the short program, but failed to advance to the free skate segment.