Promotion of the online store website

I am looking for a specialist who has experience in promoting and layout sites. There is an existing website on Joomla. Average attendance is 10-20 people per day. For many low-frequency queries, the site is in the TOP 10. The task is to audit the site, correct errors that impede the promotion, increase attendance. I want to find a specialist with whom effective cooperation on a long-term basis is possible.