Read the terms and conditions carefully. Some require purchases in separate transactions or only certain items at certain stores. There could also be limits on how often you can enter or how the winners are decided.
Take photos of receipts in case you win a second-chance draw and they require proof of purchase.
Check the Winners page to see what kind of competitions have been won as you’ll have a greater chance of winning those as well in the future
If there are any active Instant Win competitions, you could still enter those as well
If you’re short on time, check out the Top Competitions and New Competitions to see if there are any worthwhile comps to enter
Subscribe to stores that have had a lot of winners in the past and you’ll receive an alert when a new competition is posted
Movie tickets are generally easy to win
No. of Words or Less can be profitable if you’re good at them. You generally need to write something that will stand out among the other entries (i.e. a sob story).
Gleam comps with thousands of entries are pretty hard to win (I still enter them anyway)
Install the browser extension (I have both installed) to get notified when there is cashback available (and never forget again). Double-check if your purchase has been tracked on the website though, because the extension has failed me once.
Keep an eye out for bonus offers on OzBargain or your email inbox
I regularly withdraw $10 (the minimum withdrawal amount) when it is reached, to my bank account or PayPal
Sell cans for 10c each
Sell things on eBay, GumTree, Facebook Marketplace, etc . . .