They say that a penny saved is a penny earned. Actually, when you consider that you pay taxes on every penny you earn, you really do make more money by saving than by increasing your income, especially if the extra income will increase your tax rate dramatically. For example, let's say you have a choice between saving $100 or earning an extra $100. If you pay 15% taxes, then when you earn an $100, you only get $85. But when you save $100 off of your existing budget, you keep it all. To sweeten the deal further, if you take advantage of compound interest as found in most savings accounts, over time you'll start making money on the amount saved plus previous interest paid on that amount saved. It'll be pennies at first, but eventually the amount will multiply exponentially.
A spin-off for web designers is to offer a landing page creation service. Well-optimized landing pages can be the difference between a successful and a failing business. And, as creating the perfect landing page isn’t easy, this is a service many businesses are prepared to pay for. I know people who are earning 6 figures per year and all they do is create landing pages for businesses. There’s serious money to be made.
Do you enjoy fast food or going into retail shops? Many companies hire mystery shoppers to test the customer service of their stores. A common one is Subway, which hires mystery shoppers to ensure that "Sandwich Artists" are following all the franchise guidelines. If you have time and can travel to different places, this could be a good side hustle.