I guess you already knew this is not quite custom but a font named Valentine Script by Jessica Hische. So why not switching for one her creation Buttermilk, this one available to purchase.
Anyway, some suggestions I like for this sample, clearly not similars: Pauline Didone, Chikita, Dorchester Script, Madeleine, Ola Script, Sweet Script, Fling ("More Fonts Like Fling" at MyFonts), Giddelham, Samantha Script, Mischka, Little Cecily, Sofia, Sachiko, Roselyn, Dulsinea, Linoscript, Raniscript, Rhyme...