It happens to the best of us. You come in to help a large corporate customer and make a passionate plan that you can quickly deliver with some simple inexpensive tools. For example: you could setup a beautiful landing page with WordPress to communicate a department's services to the rest of the company.
WordPress or any other SaaS service is not allowed on the company network because of security regulations. Experienced digital innovators will not be surprised and know you have to adapt with whatever is available.
Maybe you feel a little less sparks of happiness (Mari Kondo at work) but if Microsoft Sharepoint is an option let's get the max out of that tool. Learn all about it and just start building. It might turn out to be fun to learn other systems and you might get surprised while doing it.