[5] As a teenager, Niki maintained a YouTube channel, on which she uploaded original songs and covers, performed on acoustic guitar and filmed in her bedroom.

In support of the album, Niki premiered a livestream concert titled Moonchild Experience, which aired 10 October 2021, on YouTube and Kaskus TV.

[16][17] On 10 August 2021, Niki released "Every Summertime", the lead single from the official soundtrack to Shang-Chi and the Legend of the Ten Rings.

[21] Vanity Fair contributor Delia Cai wrote that Nicole is "a sonic time capsule of a breakup album that explores heartache in perhaps its most devastating form.

"[22] NPR discussed Nicole on its All Songs Considered podcast and stated, "Something Niki does really well is get to the emotional heart of the matter.

"[23] Alongside the album, a short film titled But I'm Letting Go starring Niki and Peter Adrian Sudarso and directed by Isaac Ravishankara was released through Amazon Prime Video on 18 August 2022.

[27] On 31 May 2023, Niki made her debut appearance on NPR's Tiny Desk Concerts, performing "Every Summertime" alongside three songs from Nicole.

NPR writer and editor Stephen Thompson wrote that the set had him "swaying, swooning and swimming in high hopes".

[28] On 12 January 2024, Niki released the single "24", which she wrote in an attempt to synthesize her early twenties and many humbling things she had learned before turning 25.