League club Everton on 5 January 2019. He played regularly in the centre of defence for manager Danny Cowley that season, making 49 appearances as Lincoln won promotion into League One after finishing as League Two champions. Bostwick was voted Lincoln's Player of the Year at the end of the season. Having started the 2019–20 season as a regular in the first-team line-up, Bostwick sustained a calf injury in Lincoln's 1–0 home defeat to Bristol Rovers on 14 September 2019, during which he was a substituted at half-time. He returned to the first-team in December 2019, although suffered a recurrence of the injury in a 3–1 defeat at Sunderland on 4 January 2020. Having returned to the team a month later, the regular season was curtailed due to the COVID-19 pandemic in March 2020. He was included in Lincoln's list of released players on 28 May 2020 and Bostwick left the club upon the expiry of his contract. Burton Albion Bostwick signed for League One club Burton Albion on 5 August 2020, on a one-year contract. The transfer materialised after Bostwick had spoken to his former teammate and Burton fitness coach Chris Beardsley about joining the club. He made his Burton debut in the club's 1–1 draw in the EFL Cup against Accrington Stanley on 4 September 2020. Bostwick was predominantly on the substitute's bench in the opening three months of the 2020–21 season, making five league appearances. He returned to the starting line-up in December 2020 and was a regular under new manager Jimmy Floyd Hasselbaink for the remainder of the season. Bostwick scored his first goal for Burton in a 2–0 away victory against Northampton Town on 13 February 2021. His goal in the match came from an indirect free-kick within Northampton's penalty area. He made 31 appearances during the season, scoring twice, as Burton finished 16th in League One having spent most of the season in the relegation places. Described as "influential" and "key" during the second half of the season, Burton confirmed that Bostwick had signed a one-year contract extension with the club in July 2021. Bostwick was released by the club at the end of the 2021–22 season. Return to Stevenage Having made 10 appearances for Burton throughout the first half of the 2021–22 season, during which he suffered a hamstring injury, Bostwick rejoined League Two club Stevenage on 4 January 2022, on loan for