Welcome to Farmhood! You're in full swing now for FarmWars: Field of the North.
Let's see if you're 50% of the way through rank 3, you'll need...
4,000 points to finish rank 3 (8,000 total)
8,000 points to finish all of rank 4 (16,000 total)
10,000 points to finish all of rank 5 (26,000 total)
22,000 points total.
The repeatable quests give you 500 points each. So you'll only have to run a mixture of them 44 times!
Or you can wipe out a zone over and over and over and over for about 400 points per wipeout if you're lucky, and I mean leaving nothing moving of any sort.
Good luck you'll need it.
EDIT: finishing the game and turning in your full book gives you something like 2,500 rep for whoever you choose. That'll cut 5 runs off that 44 total.