I hear you, and my answer is the same strategy that is currently defeating Trump in Iran:

Rope a Dope.

Conserve your energy, maintain your stamina, conceal your strength, keep him moving.

Only take a chance at a strike you know will hit, then flutter away.

Couple rounds of that, he's having a heart attack, you win.

He notoriously has horrendous posture.

That means his core will tire out rapidly if you keep him him on his toes.