Your reheated sauce needs a finishing touch. Fresh basil. A drizzle of olive oil. A crack of black pepper. These aren’t optional. They are mandatory.
Reheating kills some aroma. The volatile oils run away. Adding fresh stuff brings them back. It’s like giving your sauce new perfume. It wakes up your nose before your mouth.
A pat of butter works too. Swirl it in at the end. It adds richness. It makes the sauce coat the pasta better. It’s called “mounting” the sauce. Sounds fancy. Takes ten seconds. Do it.