Hello jdbb123, actually when you put rocks above the drain holes, you have increased the perched water table inside, so that further delays drain out of excess water. So next time do not do that to any plant. Better to put a mesh screen on the drain holes to save the soil but still allows water to drain out.
That succulent wants much more light. That one I would definitely position closer to the window. Clean up and remove all those dead leaves. The soil does look too dense, but right now is not the right time to disturb it. Wait for Spring to further make your media grittier. Your white container is quite pretty, but being glazed ceramic, it is holding moisture longer. So be very careful with watering. No need to mist the succulents. What is the light orientation of that window?
As for the other houseplants, the older leaves are the ones I see drying out. Just let it continue to do it and trim away. I would not move the plants close to the window, they all seem to be low light plants. You may want to do quarter turns of your plant from time to time, to even out the direction where the plant sways itself too as it seeks more light.
So again I ask what is the orientation of that window, if it is north facing, then by all means move your plants closer there. But if it is south facing, keep that existing distance since your plants are mostly low light ones.
What you need to watch out for is overwatering. Sometimes even a week has passed and the soil may still appear damp, so just delay watering some more. As I have mentioned earlier, ceramic glazed containers will hold moisture longer, got to allow airflow at root zone so the roots do not stay too wet. Use bamboo skewers to check if your soil is still wet below, if you stick it in the soil and comes out still damp, delay watering. Everything just depends on your own ambient conditions there.
By the way, no fertilizers at this time. Just allow all the plants to endure the cold season, light levels are slowly going longer, so they will all soon be much happier.
