The album was promoted by the singles "Mirror", "Burning Bridges", "It Gets Dark", and "Bad Life" with British rock band Bring Me the Horizon.

[13] Writing for AllMusic Neil Z. Yeung called the album "refreshing and even more insightful than her debut" and also states that "the growing artist opts for the positive, affirmative route with the songs on How to Let Go, which merges shimmering dance-pop gems and arena-sized midtempo ballads" adding that this project is a "more established act".

"[2] David Roskin from Gigwise gave the album rating 7 out of 10 stars and wrote that How to Let Go "might be a collection of pop bangers, dipping into folk and disco, but above all, it’s Sigrid’s bold and brash journey to freedom.

"[15] Izzy Sigston of The Line of Best Fit described the project as "a patchwork quilt of organic growth and reflection" and states that "Sigrid continues to set souls on fire with her progressive yet instantly distinguishable album.

"[18] The Skinny writer Cheri Amour said that "Unlike fellow Nordic peer Aurora, How to Let Go isn’t a collection of Mother Earth cries.

"[21] In a mixed review for DIY Bethan Harper writes that "The core theme of How to Let Go becomes apparent: throughout the album Sigrid is colliding with herself, accepting everything she is, the light and the dark.