long-term continuous development (Magento & Wordpress)

Hello, I am the owner of several small websites in Spain and I am looking for a developer to trust in the long term to make continuous improvements to my websites and to grow together. Do you see a collaboration like this possible? What budget would you give me?

These are my websites:
www.hnosperez.com (switching to magento 2 right now)
www.untrastero.com

This is my linkedin profile:
https://www.linkedin.com/in/antonioperezovejero/