If you wanna play further in the series, I recommend saving Conquest/Thracia/Later difficulties of New Mystery/Binding Blade for later, they are infamously difficult (Thracia can be cheesed if you are well aware of what you are doing, however.), and my personal recommendations for continuing into the series is Sacred Stones, the Gamecube Games, and (if you can stand waiting like 5 minutes to get to the action per map, because Genealogy is slow), Genealogy of the Holy War. Personally, Thracia, Shadow Dragon, and New Mystery have my favorite gameplay in the series, for being rather tough on the player.