It was released on 11 March 2022 by Major Tom's and Asylum Records, marking Henderson's first full-length album since her 2014 debut Chapter One.

After a period of ill health, and signing a new deal with Major Tom's, Henderson would release several standalone songs as well as collaborations with other artists.

Taking a diary-like approach to the track listing, each song tells an individual story in Henderson's life.

English singer and songwriter Tom Grennan and American singer and songwriter Mikky Ekko are featured on the album, along with production and co-writes from James Arthur, TMS, Jordan Riley, Al Shux and Richard "Biff" Stannard amongst others.

"Let's Go Home Together" reached number ten on the UK Singles Chart and was certified Platinum by the British Phonographic Industry.

The following month, Henderson released a deluxe version of the album, Everything I Didn't Say and More which included singles and collaborations from the last few years including Henderson's 2022 UK top ten singles "Crazy What Love Can Do" (with Becky Hill and David Guetta) and "21 Reasons" (with Nathan Dawe).

[8] This took place less than a year after "Ghost" topped the UK Singles Chart for four weeks and achieved international success.

The decision was reported by the media to have been mutual, stating that both artist and label "felt that a change of direction was needed for everyone after the gap between the release of the first album and [Ella's] as-yet unreleased follow-up".

[15] Everything I Didn't Say explores themes of Henderson's mental health struggles, the time taken between her first and second album, and the vulnerability of heartbreak, love and self-worth.

This latter lyric was compared to the current "self-care climate" in music, drawing similarities to the song "OK (Anxiety Anthem)" by Mabel (2019) and "OK Not to Be OK", a 2020 collaboration between Marshmello and Demi Lovato.

Henderson described "Out of My Head" as one of her favourite songs on the album as it dealt with themes of narcissism and needing to write about one of the biggest narcissists she had met.

[21] Henderson said that although she wrote the song a few years ago its sentiments really resonated with how she was feeling, "it was therapeutic and I needed it".

Having performed the song during live tours, Henderson felt that fans had expected to hear it on a future album and hence it was included on Everything I Didn't Say.

[25] "Thank You for the Hell", another co-write and production by Riley, is influenced by country pop and tells the story of a situation Henderson went through, reliving all the emotions and toxicity.

[2][10] In a similar vein, Henderson wrote the title track with producer Mike Kintish, having already decided to call the album Everything I Didn't Say before the song of the same name's conception.

During an interview in the run-up to the release of the album, Henderson told the Official Charts Company why she decided against the sequential titles, saying "I wrote Chapter One in 18 months when I was a teenager.

During the naming process, Henderson reflected that she spoke a lot of "word vomit" and the album was heavily focused on lyrics.

[27] It was available on CD, Cassette, streaming and digital download formats, as well as part of a number of merchandise bundles including clothing via Henderson's official website music store.

[29][30] Both the song and music video were influenced by the COVID-19 pandemic, with Henderson confirming this with Hits Radio that it was that "feeling of a night out and the characters you meet at the pub, something that we haven't experienced a lot in the last year.

The music video depicts "a struggling single mother fights to keep her and her toddler son going every day".

[44] Henderson and Grennan appeared together to perform "Let's Go Home Together" on its day of release on The Graham Norton Show on 19 February 2021.

[46] Later on 2 April 2021, Henderson appeared on Irish radio station iRadio, where she spoke about the collaboration and how it came about with Grennan.

[47] In January 2022, Henderson made an appearance on Kent radio station, KMFM to promote the song "Brave" and album.

[48] Henderson was also invited aboard Virgin Voyages' new cruise liner, performing a set in support of the travel operator's newest ship on 25 February 2022.

[51] Henderson also appeared on Johannesburg's radio station 702 on 2 April, via video link, to talk about the album and promote its release.

[52] Evening Standard's David Smyth praised Henderson's "still might voice" and "vulnerability" across the record, calling songs like "Brave" and "Cry On Me" anthems but remarked that the "mature pop sound" might not be "enough to carve out her own space in crowded territory" but regardless, "plenty of people will be rooting for her to succeed again".

Strazzabosco also praised the songwriting, concluding that "Henderson taking her time to compose her second record, she effectively avoids a sophomore slump by putting her vocals at the forefront and reminding us why we first paid attention to her 10 years ago.

"[15] Out Now Magazine's writer Kelia said the album was "fantastic" and recaptured the relatability that "catapulted Henderson to fame at 18".

[56] Reception Writing for Writebase, Rebecca Hodge called Henderson the best support act she had seen, praising Henderson's vocals and decision to invite her band's drummer to the front of the stage to sing Tom Grennan's parts on "Let's Go Home Together".