Gohighlevel - setup of leadmanagement software for australian gym group

I am looking to set up "Gohighlevel" aleadmanagement software for us, an Australian gym operator and have a few particular needs. Specifically, I need automated follow-up sequences, integration with a CRM software of my choice, and the capacity to manage between 100 and 500 leads. With this in mind, I am looking for a freelancer who can provide satisfactory solutions to adapting the platform "gohighlevel" to our requirements. If you have experience in working with "gohighlevel" or similar projects, I would highly appreciate it if you could make a proposal for my project.

Leadmanagement platform: https://www.gohighlevel.com/main-page
CRM to be integrated: https://www.hapana.com/
additional needs: email and sms automations, calendar function and task-lists