Have lots of accounts - by far the best are Pinnacle and Betfair. Plus all of the random ones, where you can often find a line that is "off" which can give you a +EV bet or an arb.
Getting the best odds is half the battle. Say you are able to pick the correct side 53% of the time. If you get 1.91 (-110), you will get an average return of 1.23%. Now say you use Pinnacle, where you get 1.952 (-105), you will get an average return of 3.46%. Add in the random books (mostly lower odds but if you find a free point) and Betfair, and you should be getting effective odds of say 1.98, which is close to 5%.
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