To my eyes that blind is very depressing. I would remove it. I prefer rooms that are bright and cheerful. I would use grommet top panels ( white or cream) on a decorative rod. Get enough lined panels so that there is ample fullness when closed. If more light control is needed I would use simple white pleated shades with the panels. White plantation shutters would be nice, too. Window treatments should look nice from the outside as well as the inside. Quite often those shades look like sheets or paper bags from the outside. Your beautiful room deserves better :).

Have you thought about bottom up top down pleated blinds or honeycomb shades? Minimal in design and able to install as inside mount to a shallow depth of only 1/2 inch. Here are some client pictures and how they solved their bay window challenge.

I would put a rod across the top HIGH, just below the crown moulding and hang simple Grommet Drape Panels of your choice (I'd choose a color similar to the wall color). at least x4 50" wide panels for fullness. Open/stack to right side ... if you need white for the streetside, line them with white. (Then you can use any pattern you'd like)

Looking at your setup from that second angle suggests you’d have proper clearance on the left but now I wonder about the right side The space on the right is limited by the protruding fireplace “trim” (the mini “hood” above the fireplace opening and the detail below the opening). To see what might work you could purchase a 96” or 104” drapery panel, (whatever appropriate length) hold it up at height rod would be, and see if it hangs ok. Does it look squished, left to right by the fireplace? Does it hang freely? A heavier fabric panel will take up more soace, especially if it’s lined. Maybe a cotton canvas but no lining, or a blackout panel would fit. To help you decide about adequate space, consider the function of the slider. Do you open it a lot? Is that outdoor space a spot you use all the time, or does the door stay primarily closed and youre not going theough that door much. The right panel could hang partially over the door handle (door seldom opened) or it could hang so it fuly clears the door handle (use door all the time). Alternatively, you could mount a shade over the arched window that is long enogh to cover the sliders when shade is let down. (Prob requires a custom made at this length). Whether a shade or drapery, the slider door handle and limited width and height of space will inform your decision as Im sure you already know. Either woud work, but neither are ”perfect”. But perfect is seldom needed. The pros have great advice; maybe they‘ll weigh in