Arisa Weruwanarak gained her first international experience at the 2018 Asian Games in the Indonesian capital Jakarta , where she finished seventh with the Thai 4 x 400 meter relay and sixth with the mixed relay. The following year she won the Asian Youth Championships in Hong Kong in 60.52 seconds and was sixth in the sprint relay (1000 meters) in 2: 17.11 minutes. In December, she finished fourth in the 400-meter run at the Southeast Asian Games in Capas in 55.53 s and won the silver medal behind the team from Vietnam in 3: 39.78 minutes, as well as with the mixed relay in 3: 26.09 min.