Old handler not responding need to recover zoho superadmin credentials

My domain is still tied to a legacy Zoho Mail configuration that I can no longer access as the original admin is unavailable. I need the old records and account dependencies fully cleared, then the domain brought over to Gmail (Google Workspace).

The work breaks down into three clear parts:

• Remove every trace of the former Zoho setup, including any hidden verification tokens, so I regain full control of my email routing.
• Configure Gmail for the domain, verify ownership, and migrate all existing mailboxes and historical messages from Zoho to Gmail with no data loss.
• Update Namecheap DNS—MX, SPF, and DKIM records—for optimal deliverability while making sure nothing touches the A-records or other settings that keep my SmarterASP.net website online.

When we are done I expect:
– All new mail flowing into Gmail inboxes.
– Historical Zoho mail visible in the corresponding Gmail accounts.
– SPF and DKIM passing checks on tools like MXToolbox.
– Website functionality on SmarterASP.net completely unaffected.

If you prefer a particular workflow or tool (e.g., Google Workspace Migration, IMAP sync, or direct DNS API edits in Namecheap), just let me know; I’m fine with whichever gets the job done smoothly.