Taking a long time to generate results; sometimes getting a server error

It takes at least 5 minutes to generate my results and has been taking longer and longer each time I start something new. Most recently, I waited about 20 mins on the generate page, and it never loaded. I left the site, cleared cache, restarted browser, and tried again. Now I am getting an error when I submit. Screenshot attached, shows Server error (413). This is all in the Furnishing and Decorating tool.

May or may not be related but I have been using generative AI for a very long time, so my prompts are likely more detailed than what it usually handles.