New tier for home users
I self-host VaultWarden which has an option for an api key. For a small home user, I would love a cheaper option that would be rate limited by X requests per month or year so I can make use of this feature for my family. I do not need the 10 rpm of the current lowest tier.

There is already an existing tier for home users, it’s the Pwned 1 subscription available here for $3.95 per month: https://haveibeenpwned.com/API/Key
We can’t justify a pricing tier beneath that whilst still providing the same services even at a lower rate limit or quota, the overheads of support, Stripe fees and other costs make it infeasible.
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Fxzx micah commented
The subscription has already increased in price. Additionally, a lower price can attract more users to make a purchase. Stricter restrictions ensure that it won't impose a greater burden on your services. I don't understand why you rejected this proposal.
Maybe you think the price of $45 per year is already very low, but in fact, it's still quite expensive for non-US dollar users.