Maybe not using a level teaspoon or using only half if you aren't fond of too much of that spice or the last time you made the recipe it was pretty evident that that particular seasoning was being used.
I know that when I bought the McCormick ready-made taco seasoning packets, I never used the whole packet. I poured out approximately half of the package and saved the second half for the next time I did it.
Of course, there are those spices (like garlic!) that I tend to double or putting in heaping spoonfuls! But maybe there are a few spices that you can think of cutting back on and getting a few extra "servings" from the bottle.