Speaking as someone with a previous brown thumb, you can keep one plant alive. (One is doable. A whole garden is...meh. I now have a yellow thumb. lol)
1. List plants you wish you could grow. A dream wish list.
2. Read up on how to take care of them -- what they need (sun/shade, lots of water/little water/very very little water, what acid/base soil, clay/loam/sand, how much fertilizer/what kind/how to give it) and, if it's a house plant, where to put it. (South window is perfect for dessert plants, west is best for sun loving succulents and leafy plants, east is okay if it gets plenty of sun, and north is going to kill the plant, and one plant prefers a darker space then any window will give it (Iron plant) -- info only good for Northern Hemisphere.) If it's not a sun lover, then you need to learn how far from a window it has to go. (My Lucky Bamboo is fine on a table right next to a west-facing window. It would die on the windowsill. My shade-loving succulent would die next to the Lucky Bamboo, so gets a table lamp that's on 24/7 for the winter, and under my butterfly bush all summer.) And learn about the pest and diseases that plant can get.
3. Judge which one you can do with where you live and how much effort you want to put in, and then pick the one that's left.
Green thumb isn't a natural talent. It's learning about each plant BEFORE buying them. (My problem is I like to buy and then learn. Ooops. lol)