From those titles, I know Steins Gate is a visual novel, not an RPG, and Disgaea is a tactical RPG, which you said you disliked in another thread

What platforms do you possess? Dragon Quest and Shin Megami Tensei are two of the most important JRPG series aside from FF and the like, so you could give them a go. Persona 3 especially is a good starting point for SMT