Selt reached another semi final of a ranking event after defeating Stephen Hendry, Barry Hawkins, Kyren Wilson, Soheil Vahedi, and Chris Wakelin before losing to the eventual champion Judd Trump. Most notably, his first round match against Stephen Hendry, the seven-time world champion, was Hendry's first professional match since retiring in 2012. In April 2021, after dispatching Scott Donaldson 10–3 in the final qualifying round, Selt qualified for the World Snooker Championship for the first time in 6 years. He drew Barry Hawkins in the first round.