If you have enough time, you can use the way of single round robin to rank according to the level of points, which is fairer, but the schedule is longer.
Adopt single cycle, divided into seven rounds:
The first round: 1-2 3-4 5-6 7-8
The second round: 1-3 2-4 5-7 6-8
The third round: 1-4 2-3 5-8 6-7
The fourth round: 1-5 2-6 3-7 4-8
Round 5: 1-6 2-5 3-8 4-7
Round 6: 1-7 2-8 3-5 4-6
Round 7: 1-8 2-7 3-6 4-5