Analyzing the opponent's moves – paper in rounds 1 and 4, and scissors in rounds 2 and 3 – I noticed that the opponent is using only paper and scissors so far. Since my past moves (rock, scissors, paper, rock) largely provoked his paper when I used rock (which occurred twice) and scissors when I used paper, it seems he is countering my moves with the winning option, except when I played scissors in round 2, where he mirrored my move. Given that his moves are limited to paper and scissors, if I choose scissors, then: 
• If he opts for paper (which beats rock, and seems common when my previous move was rock), I win (since scissors beat paper).
• If he picks scissors, it’s a tie (avoiding a loss.)
This strategy minimizes the risk compared to playing rock, where if he chooses paper I would lose. Therefore, I choose scissors for round 5.