You cannot just go in the gym and do whatever you feel at that moment. You need to have a strict routine and follow it closely. Ask a personal trainer or an advanced bodybuilder to provide you with a program that includes the exact exercises you need to do, the number of sets and the number of reps per set. When you set foot in the gym you need to know exactly what you will do in that training session.
For every person who lifts weights these days, it seems there are two who have a podcast about it. There are more bodybuilding tips promising greater strength and muscle than ever before, and along with them a ton of confusion; one buffed-up Instagrammer says lifting heavy will get you swole, while a well-known fitness personality has claimed in recent years that two 30-minute workouts per week netted him 34 pounds of muscle in a month.