I always hesitate to guide people on how much they should eat. Mainly because I'm never sure that I'm at the right levels. Whatever level you decide to eat at it can be important to fill those calories with higher bulk/lower calorie items. You should feel less hunger eating those types of foods. I always think of some of the following as 'avoid' foods.
- alcohol (high calories, no bulk)
- snack foods (chips, candy, chocolate)
- pre-made items (frozen dinners)
Having said all that, I have the occasional drink myself. I also take multi-grain tostidos (and not baked ones) with my homemade chili. And I'm working on remaking my chocolate zucchini cake recipe to something that will work into my plan. So take what I say with a huge grain of salt.
If you're sure that you've been eating consistently at 1800 and not seeing the progress you wanted then I'd first suggest that you try switching out some of your choices first. Do that for a couple of weeks, then considering lowering the calories. If you've switched over to higher quality choices you might have an easier time with lower calories.