Good luck on learning Ren'py. I use Ren'py as well. It took me like 5 minutes to learn it. However, I haven't learned all the hard part yet like making world maps for doing a sandbox game.
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The basics were easy to learn, it’s a very practical and flexible engine! I’ve spent most of my time learning how to make and add animations using Live2D for things such as NSFW scenes or "jiggle physics". I’ve also got the basics to make a player inventory work. Is your project here on itch.io? I’m curious to see what your sandbox game is about ^^