I've been a fan of the series for over 20 years now, and I absolutely loved the FF7 Remake as well. Was easily my favourite game from last year. As far as other FF-games you should try, just check how each of them looks and what their premise is and pick whatever seems the most interesting to you. Everyone has very different opinions on which games in the series are the best, so you're probably going to get quite a lot of different suggestions for which you should play next.
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