This is where the role of the internet and sosmed very helpful because the social media that there is either Facebook, Twitter, Instagram, YouTube, etc. do not limit anyone to work and do anything.
You may not be a famous singer for not passing a talent search audition, but you can start your own YouTube channel and cover the songs so the audience can find you there.
You may not be a famous book author because your writing is not accepted by publishers, but you can create your own blog and publish your writing directly on the internet.
You may not be an artist because you do not have connections with a qualified agency, but you can be a well-known programmer and influencer in social media like Instagram or become a famous youtuber.
I may not be a renowned motivator or speaker for not having massive background and success, but I can write on the internet / website devoting my opinions and experiences, and miraculously millions of people read my writings on this blog.