No one deserves less-than-stellar coffee.
Stop storing your beans in the freezer.
Fun fact: Keeping your beans or grounds in the freezer keeps them cold, not fresh. You want to keep beans (or grounds) away from heat, light, air, and moisture. Choose an airtight jar like this one from Amazon ($9) and keep it in a cabinet away from direct sunlight and the stove. Better yet, get an opaque container like this one from Amazon ($21).
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Make your own flavored syrups.
You can adjust the amount of sweetener to your liking and make any flavor you want. Check out some recipes here.
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Or add some cinnamon to your coffee grounds.
The quickest and easiest way to breathe new life into coffee that's not the freshest, or is just kinda low-quality to begin with, is to add a pinch of cinnamon to the grounds (before you add water).
Or get more adventurous by adding cloves, nutmeg, and/or cardamom.
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Reduce bitterness with a pinch of salt.
Adding a bit of salt before you add water to your grinds should make the coffee taste a little less bitter.