I need advice

If this is the question, the answer is simple.

No company will buy your designs. It doesn’t work that way. Most actually have a policy of refusing unsolicited artwork sight unseen for legal reasons.

Your best course if you want to be a shoe designer is to follow the process mentioned, enter some competitions and hope to one day develop the skills you will need to get an internship or further education. If you can never leave mexico try looking for some local brands to start.

The Project Bluefoot has many stories of aspiring shoe designers working on their design skills, entering competitions and one day getting a shoe design job.

R