In which part of the world are you located (country/nearest large city)? Landscaping the exterior would give you dimension to your home.

Looks like a good start. When you design the new windows for balance, also design the interior window coverings. With triangular window tops, planning in advance can make a wide variety of options possible. That is, if you are going to have curtains, leave stackback space for when they are open. If you will have blinds, make sure there's space for them to pull up. If you are going to get stationary custom blinds to partially cover the windows, think about where the stationary part will end relative to where your eyes will be.

Is that real brick? It almost looks like some kind of panel made to resemble brick. If it is real, often they just did a thin veneer of brick on only a portion of the house to save money (as if we'll never see the house from the sides? what were they thinking?) Either way they can be removed/ replaced with more harmonious / congruous siding.... whenever it comes time to paint, not right now. If you do a pergola or new porch, keep it simple and in harmony with modest post WW2 1950s style. Your house is not the early 1900s or craftsman-esque style pictured above, and houses start looking like frankenstein houses when they have too many styles from different eras cobbled together. You should find that a lot of contemporary style will mesh quite nicely with your house - since it draws so heavily from that era. The conventional wisdom is to live in the house for a year before doing anything irreversible, but I dont that applies to tacked-on temporary things like awnings and such. Have fun!

While you are replacing the sectional, you might want to consider changing the rug because it's not working in this room. Get a larger piece of art for over the sofa. This company usually offers a 50% off coupon on the first order. https://www.greatbigcanvas.com/view/ochre-evening-ii,2562696/ Don't know if this arrangement really works for this room because we have not idea where you have placed the Tv.