Below is a list of job boards in higher ed that may assist GTAs in their academic job sector search:
https://careers.insidehighered.com/
https://www.mla.org/Resources/Career/Job-Information-List
https://chroniclevitae.com/job_search/new
https://www.universityjobs.com/
https://www.timeshighereducation.com/unijobs/en-us/
www.lgbtcampus.org/job-listings
https://www.lgbtinhighered.com/
https://www.asiansinhighered.com/search-jobs/