Here's the deal with keeping things seasonal - it's hard to go wrong! Afterall, that's why pumpkin spice lattes are so popular. Find a few ingredients/tastes/foods that you like and see what you can do. Not sure what is good for the fall? Keep an eye on your grocery store produce section and you'll see certain foods taking up more shelf space. Butternut squash, sweet potatoes, lots of different kinds of apples, and give those pie pumpkins a spin to see how you can use those! Don't have any recipes to use those things? That's easy, afterall, it's 2019 and Google is in nearly everyone's pocket. Just type in the ingredients with the word recipe and you're sure to find something great!
And remember, it's just cooking - we're not sending a person to the moon here. If it's gross, that's what the frozen pizza that you keep stocked is for!