Opportunity knocks at our doors every day but it comes in a form that has to be unraveled before one can notice. Every person you see is an opportunity in disguise. That is an opportunity to tell someone about Jesus Christ, an opportunity to get help, an opportunity to sell your idea, opportunity to make money, network, etc. It would interest you to know that your next big thing could be the next person you meet or interact with.
Hebrews put it this way:
Do not neglect to extend hospitality to strangers [especially among the family of believers—being friendly, cordial, and gracious, sharing the comforts of your home and doing your part generously], for by this some have entertained angels without knowing it.(Hebrews 13:2, AMP)
It’s not always the case that you will meet people like Richard Branson, Bill Gates, Jeff Bezos, CEOs and MDs, etc before you think of opportunity. Sometimes it could be the security man at the entrance, an employee, a taxi driver, or a stranger in some distress situation. Thus care should be taken so that your ego and/or pride does not become a blockade to your blessings. Remember that Naaman got to hear about Elisha through a slave maid (2 Kings 5:1-17) and David was able to recover all that was stolen when he helped that poor guy who was left behind by his master to die (1 Samuel 30).
You have no idea who God has sent your way to be a blessing therefore be mindful of how you interact with people.