That's a shame your unhappy with your phone @Mrproblems1
I owned the Samsung Note 20 Ultra SnapDragon version for a year and found mine to be a powerful device with none of the issues your sadly facing with yours.
Battery stats and screen on time is a subjective topic as we all use and set up our phones differently, however I attained at least two days usage from mine.
I did use dark Mode, sleep and deep sleep apps options for apps I didn't need lots of notifications from and that were constantly working in the background such as social media apps etc but apart from that everything else was turned On.
I did have my network connection set to 4G/3G/2G as 5G did drain the battery and as 5G isn't available on my tariff and widely available where I live I didn't need it.
I hope you find better results with your next choice of phone.
Current Phone > Samsung Z Fold³ 5G. > Software : Android 12 ~ Samsung One Ui 4.