A hook is someone with an attribute or skill that meets an institutional need of a college. Examples might be a recruited athlete (ex. a quarterback for the football team) , the child of a huge donor (hoping for more donations), a person who might bring positive notoriety to a college (ex. Malala). Colleges have no institutional need for a gamer (especially one who seems to put gaming in front of academics) so it cannot be considered a hook. It is fine to mention your accomplishments in gaming as part of your applications, but don’t use it as an excuse for your grades.
Apply to a range of reach, match, and safety schools that appear affordable and match your academic profile (including GPA).