In his fourth spell with Stamford, at the end of the 2012–13 season, he scored the winning goal in the Northern Premier League Division One South play-off final.

Miller then found success during his second spell at Boston United and was named the Conference North Player of the Year for the 2013–14 season after scoring 24 goals in 40 league matches.

[5] Miller made his debut on 19 September as a late substitute in the club's 2–1 home defeat to Lincoln United in an FA Cup first qualifying round replay.

[5] He joined Leicestershire Senior League Division One team Cottesmore Amateurs on dual terms, scoring twice on his debut, a 6–4 away defeat to Ashby Ivanhoe on 23 September.

[7] Miller then agreed dual terms with Rothwell Town, spending the latter half of the season with the club and scoring his first senior hat-trick in their 3–0 Southern League Division One Midlands home victory over Bromsgrove Rovers on 6 March 2007.

[10] He signed for Cambridge City in January 2010, after manager Gary Roberts was impressed with his record of 14 goals for Stamford in the first half of the 2009–10 season.

[11] Gordon Bartlett signed Miller for Wealdstone in October 2011 to play alongside target man forward Richard Jolly.

[19] On 2 September 2014, he joined Conference Premier team Dover Athletic on loan,[20] before being recalled just over a month later after scoring five goals in ten appearances.

[42] However, shortly before his contract was due to begin, Miller was handed a six-match ban by The Football Association for a 'biting incident' relating to his time at Dover Athletic.

[43] Miller issued a statement to provide some context for the ban via the Peterborough United website, stating he was being "held in a headlock" and resorted to biting as he was "unable to breathe".

[52] He scored a goal and won a penalty on his debut on the opening day of the new season on 4 August, helping the "Valiants" to record a 3–0 victory over Cambridge United at Vale Park.

[53] However, he was dropped after failing to score in the rest of the month, though impressed coach Lee Nogan with his performances off the bench, who said Miller just needed to rebuild his confidence following the goal drought.

"[56] He was recalled to the first-team on 19 January, following an injury to Tom Pope, and scored his second league goal for the club to secure a 1–0 win at Crawley Town.

[58] An injury to Pope saw new manager John Askey return Miller to the starting eleven on 9 March, and he doubled his league tally for the season with both Vale goals in a 2–1 win over promotion-chasing Mansfield Town; his performance saw him named on the EFL team of the week.

[67] Miller's first goal since his return to the club came on 16 October 2021, when he scored a 61st-minute equaliser to earn a replay against seventh tier Yate Town in the FA Cup fourth qualifying round.

[75] On 31 July 2024, Miller announced his retirement from football following a serious knee injury that he had sustained representing a Dover Athletic legends team.

[77] Miller is a goal-scoring striker with a high work rate, and has been compared to Kevin Phillips by former Luton manager John Still for his ability to capitalize on chances around the box.

[81] On 27 April 2015, Miller and his Luton Town teammate Shaun Whalley were both arrested by Bedfordshire Police in connection with an alleged assault following the club's end of season awards night.

[87] On 11 June 2018, the charge of assault was dropped, though he was handed a 42-month driving ban after pleading guilty to failing to provide a blood sample.

[88] Miller has talked of his struggles suffering from Attention deficit hyperactivity disorder and the impact that this has had on his football career, and the lack of support offered by his former clubs.