the next step in my writing

I've just finished my short story, Fate, and now I'm starting a new project. Beginning a new piece is always challenging for me, as I struggle to develop a strong plot and interesting characters. I have many ideas soaring through my head right now. I could continue with a similar genre like my previous story, or I could venture out on a completely different route. The idea of writing a thriller/suspense story sparks my interest, because I've always enjoyed that genre of movies and novels. However, I also enjoy dramas and comedies, so perhaps I could do a mix between them. Within the upcoming days, I will continue brainstorming my upcoming short story and hopefully by Monday I will have a clear plan of action.