We are all bounded by our belief system because through the law of assumption, you create the reality that you assume to be true for you. It means the reality we create is what we believe to be true about reality.
Your belief system is the connection of thoughts and experiences that you have gathered over the years that form how you view the world. Your belief system determines what reality you observe, which is the life you are currently living.
Our belief system generates thoughts, which generate emotions, which then generate the vibration or frequency that we emit, and that is what we manifest. Belief systems determine the boundaries of the desires we can call into our lives.

Our belief system is based on what we experienced, what we witnessed, or what society or other people have told us, which is based on their experiences. We also have societal beliefs or collective beliefs about how we view the world.
Your beliefs can limit what you are willing to try. If you believe something is not possible for you, you wouldn’t even try.
Every achievement or accomplishment made by humans starts with a belief at first. You first believe you can get that job or run a marathon, and then it eventually happens. People around you may not initially agree with the beliefs you hold, so we often limit our beliefs based on the physical proof we already have. That’s the exact thing about manifestation: you need to believe something before you actually have the experience of having it, before having proof of having it.
Be delusional, hold beliefs for which there is no physical evidence in our reality.
If you truly believe in something, you won’t give up. Our belief system is like a boundary to our potential and what is possible for us.
Every person has started somewhere. Hold that image in your mind and align your vibration with it.
Affirmations are very helpful for expanding your belief system if you do them constantly.

Manifestation is not about expressing the desire; you have to become the person who has the desire. You should visualize the future version of yourself who has the desire. Think about a future version of you that has that desire, whether it's money, relationship, or career.
Write a letter to that future version of you who has everything you desire. Pretend you already have manifested the desire.
So your goal should not be the desire; it should be that version of you who already has the desire.

Instead of focusing on the desire and lack of it, refocus your energy on what you currently have and enjoy the process.
Whenever a negative thought arises, close your eyes and start to think about all the things you are grateful for and all the things you appreciate and that make you happy.
You can always think of at least a few things that you are grateful for. It is about shifting your mindset in that moment from negative to positive.

Your relationship with yourself is the longest relationship you will ever have in your life. You need to put effort into consistently taking care of yourself.
Every time you go to negative thinking, you need to pick yourself up and support yourself. You need to do all the things you would do for a great friend or partner.

Think about the future version of you that would have that life you desired. Then think of the qualities that specific person has. Think of one specific thing that you can change right now that would get you to that future version of yourself.
If you want to be a successful business person, what would a successful business person do? They would get up early, show up, and be consistent. Start doing one of these things today. You need to show yourself proof through action that you are committed to becoming this future version of you.