If you mean 'let it go' as in, stop talking/worrying about it, then you could use "Fág é" ('Fawg ay'), which means 'leave it.'
lets go private
You say "Lets go!" in Maasai language of the African origin as "Maape!".
Taitníonn tú go mór liom. (Irish)Scots Gaelic (?)
allons-y France allons-y
In Irish it's "Ní hEolas go hAontíos" In Scottish Gaelic:
In Irish it's: cinnte / go cinnte
In Irish it's "Saints abú"
Darach go deo
dul níos tapúla
"Ας πάει"
Álainn (aw-lin)go hálainn
mo cheannsa go deo