Games like Kiniro no Corda 4

If you finished Kiniro no Corda 4, the closest matches are Xenoblade Chronicles 2, Seduce Me the Otome, The Idolmaster: Cinderella Girls - Starlight Stage, Uta no Prince-sama: Amazing Aria and Uta no Prince-sama: Debut. All 6 share its music genre and are ranked by how closely their themes and modes overlap.