My favorites:
Switching car insurance every 6 months
If you haven’t checked your insurance rates in the last 6 months or so, do it.
If you’re a good driver, your auto insurance rate should be dropping (not rising), cos you’re less of a risk to insure.
They count on you not shopping around. Don’t let them win. Use a comparison site to find a better deal (I used this one: link here).
Get cash back when you shop on Amazon
Amazon isn’t always going to show you the best deals.
Use a savings app like Capital One Shopping. It auto-compares prices and applies coupons while you shop. It’s free so prob worth a try.
Find someone to help manage your money
If you can find the right financial advisor they’ll help make sense of your money and help you plan for the future.
People with a good financial advisor can see yearly net returns boosted by ~3% (Vanguard, 2019).
If you don’t know one, try a comparison site to find someone with solid reviews (link here).