Your houseplants will never look as bad as they look right now.
Sad looking, pale green, leggy, soft, and weak growth. This is the worst time of all for houseplants. They look like how we feel. Only one more week of this winter sunshine ebb, and then the sun will start on its way back. We can start counting down the extra minutes on the 21st.
Then look forward to the end of January when green things in the house will start to look perky again. Until that time, get those plants in your sunniest window to catch whatever rays there are.
In the meantime, I recommend lighting candles at dusk, and getting the Christmas lights out asap. Humans need light therapy too.