Bed sheet over plants isn’t protecting them at all… Tomato, fig, and cayenne pepper.

Should I just let them die? Could they maybe survive till late February when it warms up? Also noticed that the stems are still quite green and firm on the tomato, could I propagate it and keep it inside till it starts warming up? Not sure if pepper and fig are strong enough to propagate however. TIA

Should add that my mango, mint, lemon, and an unknown species of tree look okay but no growth.