Create a Landing Page using the Homepage and Call-to-Action options.
To create a landing page:
Start a new website and select the relevant category.
In the Website Editor, on your Homepage, click the Goals button and choose an Action Type. Read about Homepage Call-to-Action Goals.
Edit your Homepage Text accordingly
Click Pages, keep the pages you want to display as sections on your landing page and remove the ones you don't need. You can Add a Page, like Donate, Events or any other page you like and edit it accordingly.
Make sure to Hide the Pages from Menu, Homepage, Footer, and Mobile.
You can add a Floating Contact Button to increase conversion.
Lastly, change the Website Type to Single Page.