Stop being arbitrary. Why try to put many possibilities and thoughts into one single sketch? How can we be certain the one you picked in your mind was the optimal choice? Ideation is a process of visual deliberation. by retaining the proportion and architecture truth you developed from the early research, Do ten instead of one, try to develop a habit of producing many quick and simple sketches, rather than a few highly detailed ones. Try to avoid the mistake of getting trapped with one sketch, this is a much faster way to improve both the design and drawing skills than laboring for hours over one sketch, and have many concepts to be tried out and evaluated.
Use moodboard to train your eyes, develop a good taste for good works and capture the essence of visual language and the trends, explore and visualize them in the same family language.