I like the style of your painting! Personally, when I draw buildings I like to start by freehand drawing the biggest outlines of the building, while paying careful attention to what angles the lines have. Then I like to figure out where the vanishing points should be based on those outlines, and I either draw vanishing points on the paper or just mentally keep track of where the vanishing points should be. One thing to remember is that in two point perspective views like this, the two vanishing points will always both be on the horizon line, and the horizon line is at the eye level of the camera. In your apartment building all the windows and siding lines are converging well toward the vanishing point on the left, but the issues are with the lines that should be converging toward the vanishing point on the right (like the stairs and sidewalk lines). If you think about where the vanishing point on the right side should be (which should be somewhere along the horizon line) then you can make the lines in the stairs and sidewalk converge toward that vanishing point.