If you are looking for random motives to draw or for practice I can recommend https://line-of-action.com/ and this topic https://krita-artists.org/t/virtual-plein-air-with-krita
The art world has a lot to offer, it’s hard to make a recommendation. Only you can know what you like. The things you mentioned are not really genres though. More different styles or techniques. Genres would be more like Fantasy (which is what I mostly do), Steam Punk, Science Fiction or something. Either try a lot until you find something you like, maybe you like doing pointillism or surrealism or maybe you like expressionist fantasy paintings. Only you can find out :3. Most people like drawing things they also enjoy outside of art, like little kittens or cars or anything.