Bon Appetit has some tips for making a better cup of coffee. These are for regular brewed coffee and not cold brew.
Pre-warm your mug. If you pour your just-right temperature coffee into a cold mug, you’ve blown it. Make a little extra hot water and (especially if you do it pour-over method) and pour some into your cup. They say you will keep the temperature and flavor longer.
Don’t boil the water for your coffee. They say the optimum temperature is 200 degrees. If you boil your water for pour over, let it cool down a little.
Use your beans up. Don’t let them sit around for special occasions. This is also assuming you are buying whole beans. The further out the beans are from the date they are roasted, the weaker the flavor is.
Use the Golden Ratio. They say the ratio is 1:16 as a general rule, or 22 grams coffee to 352 grams water or about 3 tablespoons for every 12 ounces water. The ratio can be played with to your liking, depending on how strong you want your coffee.
Wet your filter ahead of time. If you are making your coffee pour over or drip, wet the coffee filter before putting ground beans in. Using some water first will help remove any flavors in the filter and hold tighter to the machine.