Reinvest your earnings. You can grow your portfolio even more by reinvesting your dividends. This means that when you receive a dividend payment, instead of keeping the money, you use it to purchase more shares in the company. Consider doing this every time you receive a dividend until you need to live on the passive returns (perhaps at retirement). Your equity and in turn your dividend payments will continue to build during this time.
I don’t look at Checkout 51 before I go grocery shopping. I just do it after I grocery shop so that I don’t get influenced by their product coupons. A lot of the coupons are for non-produce goods, but for certain things like diapers, it really saves money because I can stack my coupons (e.g. $2.00 print out coupon, and then another $3.00 from Checkout 51 for a total of $5 off the economy box of diapers).