Is there a way to add a Tour on all the pages/routes?
Since you're using the Tour UI module, add the routes to the list
All node pages have the same route, entity.node.canonical
For view pages, they are unique. You can use Devel's Webprofiler module to see the route names, ex:

They are basically structured as view.[view_name].[display_id]
Note: display_id is also known as the machine name value.


Is there a possibility to have wildcards in the routes? Chances are
thin

There isn't. You would have to tinker with the Tour UI module's code.

Also, is there a way to enable tour for a specific node?

There isn't. You'll prob have to use one of the hooks shown in tour_test.module to unset if the entity/node id is not the one you want.

Because of the routing limitation, seems to me like the core tour module was built towards showing how to edit or configure pages for administrators and not catered towards anonymous users. For your use case, you're better off using
D8: Bootstrap Tour module which is using the bootstrap tour library

No need to be familiar with Drupal routing names to be able to assign
a tip to a page, this modules works purely on jQuery selectors so you
may add the page body class plus some jQuery selectors to target a
specific page instead of routing name.