“Let It Roll” expresses themes of a futile relationship and one’s obsessive love becoming their own detriment, as expressed through the repeated line, “Weigh down heavy like you did before/ Let me hold your rolling heart of stone”.

Moreover, In an interview, Capaldi briefly explained the melody behind “Let it Roll”, as well as other songs of a similar style. As a result of attempting to liven up his workspace at home, his songs have resulted in what he describes as,

[Something] like, still really sad, but fast, like you’re crying, but you’re running while you do it.

Furthermore, this song, like many others he has composed, was inspired by “girls he’s met”, as can be read in this interview https://www.rollingstone.com/music/music-features/lewis-capaldi-interview-1001491/.
As a result, “Let it Roll” was born, accumulating praise for its beautiful, intense melodies and orchestral tones.