Seeking advice on 10k CMS item limits for client’s website

Hello! We are developing a client’s website that will have around 15,000 CMS items at launch.

The Business CMS site plan meets all our needs except for the CMS item limit.

Honestly, we do not require any additional features of the Enterprise site plan. And it is certainly beyond the client’s expense expectation solely because of the higher CMS limit.

Does anyone have experience with similar situations and can provide suitable options or advice?

Thanks~