Stuck In Loading Screen

DontTouchMyTea  The issue of broken lots has been reported, extensively, and is hopefully on EA's radar.  But in the interim, there's no reliable way to fix the broken lots other than (sometimes) to place them unfurnished.  Please see this for further information:

[OPEN] Endless Loading/Crashing when trying to load a certain lot | EA Forums - 11650751

As a side note, is there a reason you've plugged one monitor into your motherboard?  I realize you're using HDMI for both monitors, and your GPU only has one HDMI port, but I would expect at least one of your monitors to support DisplayPort too, and the GPU has three DP ports.  Still, it's not a major issue as long as you're running Sims 4 on the Optix monitor and therefore with the dedicated card.