You can reduce frequency. This would definitely be my first choice. If you’re using the 4 day upper/lower split, just switch to the 3 day version. The slightly lowered frequency/extra day of rest between each workout should GREATLY improve any recovery related issues you may have. If you’re already using the 3 day version and it still seems like it’s too much for you, see below.
One of the most misunderstood areas for new bodybuilders is nutrition. I talk to guys all the time that have no idea of their daily calorie intake, their daily protein intake, their carbohydrate intake. They have no idea of what types of foods they should be eating, or when they should be eating them. They don't know what supplements do what and what they should using. Let me refer readers to some of my other articles that detail these areas.