We all know of many actors (https://boards.straightdope.com/t/shelley-longs-and-david-carusos/704455) who have been on hit shows and decided to leave (https://nypost.com/2016/03/04/these-arrogant-stars-left-hit-tv-shows-and-their-careers-tanked/) at the height of their popularity (https://forums.stevehoffman.tv/threads/actors-who-left-a-hit-show-probably-regretted-it.357360/) in hopes of launching a career (e.g. McLean Stevenson (https://www.quora.com/Who-would-be-an-example-of-an-actor-who-thought-they-were-bigger-than-the-show-they-were-on-and-found-out-they-werent), Shelley Long (https://www.looper.com/11431/stars-whose-careers-tanked-leaving-hit-shows/), and David Caruso (https://www.reddit.com/r/television/comments/web1ls/the_david_caruso_curse_tv_stars_who_left_a_hit/)); most times (https://archive.seattletimes.com/archive/?date=19990223&slug=2945701) they flop (https://www.quora.com/What-actor-left-a-major-TV-show-for-other-projects-only-to-fade-away-We-all-know-of-many-actors-who-have-been-on-hit-shows-and-decided-to-leave-at-the-height-of-their-popularity-in-hopes-of-launching-a-career-most).

Lyle Waggoner left Carol Burnett and then landed a recurring role opposite of Lynda Carter on Wonder Woman. I'm not sure if he quit or was let go, but after WW Lyle really disappeared. I thought he was great on both CB and WW.