Gunns ultimately retained the title and Starr was forced to leave the company. On November 10, 2016 at Revolution Pro Wrestling (RevPro)'s "Global Wars: Night One" in London, England, Starr teamed with Tyler Bate and Trent Seven, losing to Evil, Tetsuya Naito, and Sanada. Evil got the pin on Starr. Starr won the RevPro British Cruiserweight Championship on May 11, 2018, at RevPro Epic Encounter 2018. He defeated Kip Sabian at a RevPro event on January 11, 2019, to successfully defend his title. He would go on to hold the title 364 days, until losing it May 11, 2019, at RevPro Epic Encounter 2019 to El Phantasmo in a ladder match. In July 2017, Starr defeated Bobby Fish to qualify for What Culture Pro Wrestling's (WCPW) Pro Wrestling World Cup after hitting Fish with a "Product Placement". Starr was eliminated by Jay Lethal. Around the same time WCPW turned into Defiant Wrestling, Starr joined the heel stable The Prestige with Joe Hendry and El Ligero. On January 5, 2019, Starr wrestled Pac in Pac's debut match for Defiant Wrestling. At Built to Destroy'19, Starr defeated Rampage to win the Defiant World Championship. On February 11, 2018, in a match for , Starr challenged Nick Aldis for the NWA World Heavyweight Championship. Starr was the fifth challenger in The Aldis Crusade. Starr tapped out to a Cloverleaf. At Super Strong Style 16 for Progress Wrestling, Starr won the SSS16 tournament that took place on May 6, 2019. In a promo leading up to the event he called out Progress for their reliance on WWE contracted superstars, saying they lost their identity as an independent wrestling company. Due to him winning the tournament he will receive a match for the Progress Wrestling World Championship against NXT UK's Walter. Starr captured the Over The Top Wrestling World Championship from long-time rival and friend Jordan Devlin on October 26 in Dublin, Ireland. On June 17th, 2020, Over The Top Wrestling announced David Starr was stripped of the championship after information was made public of him conducting sexual abuse. Starr pays homage to his amateur wrestling career with a tattoo of the United States Wrestling logo on his right thigh. Starr's favorite wrestlers as a child were "Superstar" Billy Graham, Ric Flair, Dusty Rhodes, Chris Jericho, Stone Cold Steve Austin, and The Rock. Outside of wrestling, Starr is also a big fan of Floyd Mayweather, Conor McGregor, and Muhammad Ali.