Looking at the pattern so far, we had three consecutive ties followed by me winning with paper against rock. My opponent seems to be matching my moves initially, but deviated in round 4. If they're trying to detect patterns, they might expect me to play paper again since it just won, and counter with scissors. Alternatively, if they're trying to match my previous move, they'll play paper. Either way, scissors would be a good choice - it would win against paper or tie with scissors. Given the psychological state after I just won a round, there's also a chance they might try something unexpected, but scissors still gives me a balanced approach for this situation.