[3] Due to work commitments and other issues, Allt and Morland had left the venture by December 2014, and Stuart Fitzgerald joined the remaining three committee members in February 2015.

[12] They faced Sandbach United in the First Division Challenge Cup final on 1 May 2017 in Runcorn; Jamie McDonald scored the only goal of the match, which led the club to win its first ever trophy.

[13] They defeated Whitchurch Alport 1–0 in the playoff semi-final and beat neighbours Litherland REMYCA 3–0 in the final,[14] also facing Premier Division side Barnoldswick Town in the final of the League Challenge Cup and winning the game 3–2 on penalties, despite being reduced to 10 men and subsequently 9 men after Matthew Williams was sent off in the 1st half and Kevin McEllin was sent off in the 1st period of extra time.

City of Liverpool FC became only the 2nd team in the history of the North West Counties League to win the historic Cup double after Cammell Laird did the same in season 2004–05.

Subsequently, a member's council was formed and voted Sarah Comber as its chairman, with initially Francis Stanton and latterly Andrew Lavin elected as secretary.

On 5 August, the club travelled away to fellow Premier Division side Padiham for its first-ever game in the FA Cup, which City of Liverpool won.

On 1 September, the first FA Cup run came to an end with a deflected 95th-minute winner handing Nantwich Town a 2–1 victory in front of a record crowd of 1,022.

In the FA Vase, the club progressed to the 3rd round before being beaten by Stockton Town of the Northern League, who themselves went all the way to the final at Wembley Stadium.

In June 2018, Comber resigned her position as chair of the member's council and was subsequently replaced by Paul McGrady, who was co-opted onto the main board of directors on an interim basis pending a full meeting of the supporter's council; however, following a nomination process, no other member was nominated for the role and McGrady was elected unopposed.

On 14 July, the club travelled to Merthyr Town of the Southern League to play for the prestigious Supporter's Direct Shield, losing 3–1 in what was new manager Craig Robinson's first full game in charge.

After an excellent debut season, Robinson led the team to its first title success, winning the North West Counties Football League Premier Division with 91 points.

A 2–0 away victory at Irlam on the last day of the season, as Bootle drew 1–1 at home with Northwich Victoria, saw the lead change hands again and City of Liverpool crowned champions.

In the FA Cup, the team reached the 2nd qualifying round before losing to Chester FC of the Conference North in front of the club's record crowd of 1,834.

In the FA Vase, a disappointing 0–4 away loss at Hebburn Town in front of yet another record crowd, this time 1,304, ended the club's hopes in the 1st round.

Prior to the end of the season, City of Liverpool defeated Buxton in the FA Trophy before being eliminated 2–0 by National League North side Darlington.

In December 2015, the club agreed a deal with Bootle that saw them ground-share in neighbouring Sefton for the 2016–17 and 2017–18 seasons while they continued to search for a permanent home within the city.

In March 2022, the club announced that they will play their home games for the 2022–23 season back at Bootle, after instigating the one year break clause with Vauxhall.

[23][24] Membership is obtained by paying an annual fee to the club (£10 for adults, £5 for concessions, and £1 for children) and entitles the owner to a single share.