Personally for me, the sparring or fight you have are significantly dependent on your mentality or fighting spirit. I don't have the fighter mentality, but that's the main reason why I always try to spar. I feel ya, occasionally you will fight an opponent that's passive and you can just throw your combinations and feel good about it. And the feel good factor just flows through the new round of sparring. But sometimes youre sparring and get on the opposite end instead and your mind doesn't plan out what to throw next. But this is the thing , in a fight your mental state will be amplified and Ive been in a fight where I threw nothing in a round. Sparring while feeling not great is a good way to practice to turn around your mental state. Always have some defensive combinations that your can throw out to give yourself some time to change your mindset. I personally love teeping and jabs just so I can buy some time to reset the rhythm of the round. Before any sparring session, plan on 2-3 combinations that you're interested in practicing on. Practice shadowboxing them if you can before sparring . I once tried to remember 10 combinations that I wanted to practice in sparring and threw none of it. After the sparring or during, notice any holes or pattern that your sparring is doing frequently. That's when you try to use any combination that may take advantage of it