Is there anyway to put all my pages into one prototype link?

Just have one page. Then put all the designs on that one page.

Click on the first design > Prototype > New flow point > join up all the pages (ie, drag a flow to each page)

Once you have the flow, open the prototype and click on the blue share button. From there, copy the link (Make sure anyone can view it, a setting you need to check).

You can’t put all pages in one prototype link, interactions can be within one page only, but you can copy flow link from one page and add it to prototype in another, so it will be some kind of one prototype link.

Like this

Or put all designs in one page.