Hey, Viviana (@Viviana_Elinger)!
Hope you had a wonderful weekend.
Great question! If you wish to have someone helping you to change the theme, I recommend you to consult with Shopify Experts. They are Shopify approved experts with proven records. Feel free to browse their portfolios and see which one is best suited for your aesthetics. Alternatively, if the portfolios become a little overwhelming, you can list your request at the bottom of the page by clicking on Create a job.
This way, the experts can contact you directly and offer you quotes on this task. Let me know how it goes!
Thank you for your kind words.Happy to help you.