The mobile design: layout and margins look out of place on Firefox Android. The lists with red crosses look disjointed.

Header: why do the Sign In and Get Started links point to the same URL? Do you need a Home link for what's essentially a single page site?

The Steps section: could probably be better presented by a video above fold in the future to take far less space.

The Newsletter section: the white background and wide margins makes the section seem like it belongs to the previous section (Step 3).

I think you could use a WP performance/caching plugin to easily improve site performance. My favorite combo right now is Breeze and Cloudflare.