Grin experiment was a lot of fun. I've learned many things from it. But for now, it is time to move on to the next one. Mining Grin isn't really profitable anymore unless you sell right away. Hold for a few weeks/months and inflation will take a big cut of your profits. I'm currently mining Grimble: https://bitcointalk.org/index.php?topic=5104584.0 the first Grin fork with adjusted monetary policy.. Difficulty is catching up quick now, but not near as high as Grin fortunately