How to pick a plot

I’m generally decent at coming up with characters and broad ideas for worlds, but it’s when it comes to nailing down a plot that I struggle. I tend to lean towards the fantasy genre, and I often draw inspiration from anime and things like Game of Thrones, are least in recent years.
All that to say, does anyone else struggle with this kind of thing, and if so, how do you deal with it? Any advice helps.