I have no time for a second account but from what some guildies talk about, the way to go is to
A) start several accounts and space them out going past lvl 7 (or 8) to open arena and check the standings to see where the shard is at. 20k is the max from what I understand.
B) this can be done with or without A, get to lvl 6 or ( 7) just before you unlock arena and keep collecting free refreshes but don't spend and stay out of opening arena. Then after 2 weeks or so, you can jump in and spend energy for a day or 2 and rank up really fast to get an advantage in arena.
Good luck.
You could also spend money.