Unoriginal, but I’ve played extensively at solo RPGs like The Witcher 3 (and I cannot wait for the next DLC and the next game), Cyberpunk 2077, Skyrim (since modding heavily still works on Linux), or casual, cosy games like Descenders and my beloved Stardew Valley (which is the game I’ve poured the most time in my life). All of those are great in their own ways, but if I had to give 3 less famous gems, I’d say :
Wandering Sword (wuxia-themed RPG in 2D-HD, absolutely great) ;
Eastshade (peaceful walking sim where you paint stuff and discover a wonderfully handcrafted world. Highly recommended) ;
Our Life: Beginnings and Always (a visual novel, imho the blueprint of what this type of game can bring in terms of interactivity to the players. Lovely story, great characters, tons of personalization, superb overall).