security for my Bitcoin holdings

I am reaching out because I'm seeking assistance and expertise in implementing a secure way to store Bitcoin Holdings.

I possess an institutional Coinbase account equipped with custody features, but I'm in search of a more robust and secure approach to safeguard my Bitcoin holdings. After extensive research, I've come across numerous recommendations for the COLDCARD device as an excellent option. Specifically, I've stumbled upon a resource known as the "COLDCARD Paranoid Guide."

It's imperative to emphasize that my utmost priority is achieving the highest level of security for my Bitcoin holdings, and I'm willing to allocate significant resources, both in terms of cost and effort, to attain this goal. Given the substantial capital I have under management, cost and complexity are not primary concerns.

While I admit that I lack expertise in IT and software matters, my primary focus is on establishing the most secure and user-friendly setup available. I value security over all else in my Bitcoin storage strategy and would appreciate guidance on whether the COLDCARD Paranoid Guide aligns with this objective.

I'm fully committed to investing the time required for an extensive learning process, even if it takes up to a month of continuous effort to implement the instructions provided in the Paranoid Guide.