Hi. I hear you on spices being a recent discovery in life; my parents - gawd love 'em - ate an extremely bland diet and raised us the same way.

I recommend Montreal steak spice. Is that widely available in the US? I'm not a fan of the chunky texture, though, so I cheated and put it into a pepper mill.

I bought a second coffee grinder for spices like rosemary. I love rosemary + garlic powder. I do my pork tenderloin with a rub like that.

My go-to for sweet potatoes is a vegetable rub I buy at my grocery store, but it does contain sugar. It's mostly sage, garlic powder, paprika, and I assume salt and pepper. I should try making my own minus the sugar. That said, I only use a little sprinkle. You might have to do a bit of label-reading, but there are a lot of pre-mixed spice blends and sauces that you might like.

Are there any particular foods that you're looking to spice up?