I'd recommend mage boxing, since it would be the easiest and fastest way to go.
All you need for effective mage boxing would be 99 mage and 99 constitution.
If you train only these two stats, you would be around level 60.
Hence, you would be a maxed mage staker, able to stake against 138s, and most probably able to own all the other level 60s who dare stake you.
Good luck, and hopefully this helped.