Getting problem after upgrading the MySQL-5.7.44 to MySQL-8.0.36

After the new notification from AWS to upgrade the RDS from MySQL-5.7.44 to 8.0.36 the special character that were their in my data are converted to an encrypted format that are non-readable due to which I am facing many issues. I cross checked my migration process that seems file to me but not have any idea how to correct that. Is their any other procedure thorough which I can migrate my RDS and the data in it won’t get affected Please guide me to solve this issue!!