US 35% Duty - how to deal with that....

I've added a new tax to my setup calling it US35% Duty/Tariff and it applies to all US customers only.

Probably it will kill my US customer business, but what else can I do? Shut off shipping to US altogether?

I can't absorb the duty, and so I have the customer pay it up front. If they really want what I have (some products simply aren't available anywhere else at all) then fine, but for ordinary products this will stop folks cold.

Canada Post has teamed up with https://Zonos.com and Zonos will collect the funds and provide me with a code so I can complete the shipment to the USA.

If the US wasn't around 25% of my business I wouldn't bother, but what else can I do???

Sign me,

Really ticked off!