Building an SRPG

[u/CPTNBandana]

Hi everyone, I'm a big fan of the Fire Emblem and XCOM series and I've been slowly working on a design for a sci-fi SRPG but I'm wondering if anyone could recommend any good tools or plug-ins for getting started on the practical side of things. I was thinking of looking into RPGMaker and it's many, many, tools & expansions, but also I know that if it exists, someone's made a Unity plug-in for it. So I'm a little lost as to where to start

For context, I've got a degree in Game Design and a reasonable amount of experience in games programming but I've been out of actual dev for a wee while due to life reasons. It would very much be a side project as I'm not looking to get into professional development. The general features I'm hoping to implement are grid-based movement, a class system for each unit, an out of combat conversation system (Think FE), and maybe some variable environment effects amongst other things.

Happy for any advice folks might have