To put into perspective the challenge

I spent 4 years apprenticed to a master photographer before I went into business. I didn't realize it at the time, but it would take me a further 6 years to progress enough that I can look back on my work at the time as reliably and consistently delivering value to my clients.

At that time, there were no cell phones and no digital cameras, so the barrier to entry to photography in general was much higher. Today, practically anybody can take a "good" picture by sheer luck (you can take thousands of pictures for the cost of a single frame of film). As a result, the supply has greatly increased. To stand out in this market you need to be even better and now you have to compete with AI generated art as well.

You may also find that many (most?) publications will have technical specifications for submission that you cannot meet with a phone.

All that being said

As a self-professed amateur, your best bet is probably to not worry about getting paid yet and just focus on developing your own skills. Push you cell phone as far as it can go, then invest in some better equipment once you can't progress any further without it. (You can learn a tremendous amount without a DSLR or mirrorless, but there is still a fairly low ceiling compared to what you can learn with one.)

If you do have anything that is really good, your best outlet is most likely submitting it to an online source for fine art on demand or a higher cost options is to print and place it for sale directly (many coffee shops and similar venues will sell artwork on commission). But don't get your hopes up too high in either situation.

It is also possible to sell work if you submit it to some competitions, with the added benefit of getting feedback on your work.

Finally

You also need to consider that the Dunning-Kruger Effect may be (probably is) at play. Every photographer goes through a period where they have progressed enough to recognize their own improvement, but not yet learned enough to realize just how much they have yet to learn. During this period the self-assessment of their work is wildly skewed. To overcome this, seek out experts in photography who can give you an honest (even brutal) assessment of your work. Your peers are ill-equipped to provide meaningful feedback.

Don't let any of this discourage you. My mentor gave me the same talk when I first came to him for advice on selling my amateur work and—though I didn't like hearing it—it made it possible for me to truly start to grow as a photographer to the point where I could make it my full time living for nearly 25 years.