If you need help going from wide to long format, see these videos:
https://youtu.be/_86IlMSI3o4
https://youtu.be/4-sqsCANxHU
https://youtu.be/dcWuHcC98EU
To see other mixed model videos, see this link:
https://youtube.com/playlist?list=PL8F480DgtpW9_IT7xN1XeRF_dglZmK0nM