@donaldwe could just be a "mediocre" battery. I would suggest that you first calibrate your battery. [[Battery Calibration]]
Next, you want to make sure that your phone does not run any apps in the background that may use power. Start your phone in safe mode and see if your battery lasts considerable longer.
Also, turn push notifications off. Next you want to turn on the power saving mode and see if that helps. For your Samsung get the isettings information [https://www.samsung.com/ca/support/mobile-devices/galaxy-phone-power-saving-mode/#:~:text=First%2C%20navigate%20to%20Settings%2C%20and,background%20network%20usage%20and%20syncing.|from here]
Ultimately, it all depends on what you do with your phone. The more you use it the less it will last. Streaming audio and video as well as playing games will drain your battery quickly.