Contacts, custom fields, tags and list membership export cleanly. ActiveCampaign's data structure maps onto GoHighLevel without much difficulty, which makes this one of the simpler migrations.
Automations and email templates do not transfer. They have to be rebuilt. For a business with years of refined sequences, that is the significant part of the work and it should be scoped properly.
Be honest about deliverability. If your email performance on ActiveCampaign is strong, moving carries real risk. GoHighLevel's email is capable but ActiveCampaign's deliverability tooling is better, and a poorly managed migration can cost you inbox placement. We configure authentication and warm-up properly, but we do not promise you will match what you had.
If email is the overwhelming majority of your revenue, the honest answer is often to stay.
Our migrations start at £1,995 with a full test migration before cutover.