You need to give us a accurate body fat percentage to for us to tell what shape you are in. Or a front double bicep pose or some pictures showing your physique. It is hard to give some one advice without knowing their body fat.
First off I am going to be blunt with you. 20 years old is a young age to cycle at and you are risking going on Testosterone replacement therapy for the rest of your life. Or significantly lowering your natural production forever. If you decide to try to go pro you can guarantee you will end up on TRT their is a 80 percent chance you will probably higher.
The steps to going pro is learning about nutrition and what type of diet you need to do different types of transformations to your body. Their is of course the dirty bulk, The clean bulk, cutting diets, No carb diets and many other theories and ways of manipulating your body through nutrition that is one of the most important things is to become educated about diets. And I am not talking about just knowing different diets you have to become a guru basically.
As for the drug part the next step up is dangerous and can have irreversible side effects. The pro's you see on stage are using any where in between 4 to 8 grams a week. Some might use less but a lot of them fall in that category. They are also using insulin and large amounts of HGH and IGF-1 and different research chemicals like peptides. And of course a lot of them use synthol to get lagging body parts to look better.
Trying to go pro is one of those decisions that will haunt you for the rest of your life if you are not happy with it. Most pro's do not make good money. Only the top ten in the world really make good money. And still they struggle to pay bills and most the money is just going back into their physique and living expenses. Very few pro's make good money maybe 10 of them do like I said.
The reason I say trying to go pro can haunt you for life is because you can easily go on testosterone replacement therapy from trying to do it. Or get negative life long side effects from HGH and insulin. Their are some safer protocals for using HGH and insulin but to be 100% honest at the end of the day your still taking a chance with your health no longer how safe you convince your self it is.
I personally think you should wait a few years before trying to go pro. Your body is still developing and so is your mind and attitude towards life. When I was 20 I thought a lot different than I think now. It is a dramatic change year from year mentally you go through from the ages 14 to 25 your brain is still developing and so are your goals in life. I am just telling you that you do not want to make a decision that is a permanent one. With bodybuilding in a matter of 3 to 6 months you can alter your life forever. Especially with high dosages of different compounds trying to go pro.
It might sound like a amazing idea to try to go pro at the age of 20 but I know many people who have tried and when reality hits them about the health side effects of the sport and their not being any money involved they come to their senses and say fuck this. But still most of them end up on TRT from even trying to compete at a high level.
The answer to your question realistically in what the next step to going pro is would be acquiring more knowledge about HGH cycles, steroid cycles, insulin and what pro's life's are like. While also learning more about training and nutrition. I am not going to advise anybody to jump on hgh and insulin and high dosages of steroids to go pro. Also most bodybuilders really start hitting the dosages hard around 23 you should give your body more time to grow and develop. Going all out on dosages at a young age can fuck up your future potential in bodybuilding. Just look up trey brewer the old Bsn athlete. He got up to 300 pounds at 23 years old and just fucking ruined his physique to much drugs and to much food. My advice to you is wait a few years before you make any life altering decisions and really think to your self about the reality of the health issues and financial issues of bodybuilding.