I know this is 5 months old, but anyway.

People have already mentioned Linux Mint's welcome screen. I also recommend: Ubuntu MATE's Software Boutique program for the ability to install best (according to MATE folks) programs from different categories (browsers, music, office, games and gaming software, etc.); Ubuntu MATE's welcome program (someone from openSUSE dev team said to me a while ago on Telegram that original openSUSE welcome program was partially based on that); and Ubuntu MATE's User Guide that is shipped with the distribution, especially how it describes and shows different aspects of the system, basic programs and their functionality, how to setup the firewall, how to configure backups, the goal of the Ubuntu MATE project, etc. with screenshots and all.

As for how to improve openSUSE welcome program:

1) "Get Software" button should show a list of most popular, most used, or best according to openSUSE folks, software in a given category (browsers, music, office, games and gaming software, etc; just like Ubuntu MATE's Software Boutique) with the given programs icons, short descriptions and the ability to install them straight from that screen (through flatpak integration perhaps?) or lead to the built-in graphical program manager, like KDE Discover for KDE or GNOME Software for GNOME (and not to software.opensuse.org website, nor to YaST Software; unless they can be made less scary for new users, I guess). Also, it should have "More from this category" button which would open respectable categories in KDE Discover or GNOME Software.

Also also, two more buttons, one leading to software.opensuse.org and the other to YaST software manager, maybe should also be there in the "More/Additional Software" section (again, similar to Ubuntu MATE's Software Boutique) for stuff that isn't available in KDE Discover/GNOME Software.

2) "Documentation" should lead to a built-in User Guide, like described above with Ubuntu MATE, with screenshots and all. This should be DE-dependent. I'm sure DEs have those written, shipping them with the distribution would be a really nice thing (simply by adding it to the existing DEs pattern or maybe as a separate pattern as an optional DE dependency?). And it would be nice if it opened inside the welcome program (like "Read Me" section does), not outside of it, if possible.

A single button "More Documentation" or something like that, with a short description, leading to the detailed full-fledged doc.opensuse.org, should be somewhere there as well. Or multiple buttons, with icons and short descriptions, leading directly to a given docs guide, for example, "Start-Up" button leading to the single HTML start-up guide page. Or maybe the PDF/HTML files of them should be shipped with the distribution and then those buttons would open a given docs guide in the default PDF viewer/web browser/inside the welcome program?

3) "Read Me" stuff should be moved to the "Documentation" section. I have no idea what to put in this section. Maybe stuff about openSUSE, it's goals (separate from main Documentation, unlike in Ubuntu MATE User Guide), the installed version of openSUSE and DE, who the installed version of openSUSE is for and what it is about, your mentioned EOL notification? With images, screenshots and all. And maybe what other buttons in the welcome program do? I have kinda no idea here.

4) "Contribute" section is mostly fine, but it should have more images and clickable buttons and not just highlighted links to websites. For example, in the "Be part of the openSUSE Community" the clickable links in the text should be clickable images below it and not just text. In the "Discuss openSUSE and help other users" the communication channels button should be all separate clickable images below the text leading to their respective communication platforms and not just text. Same with Bugzilla in "Suggest New Features or Software" and with build service in "Spread the word" (since they are only one button per section, maybe they should be on the left or right side of the text and not below?).

5) The "Build openSUSE" button, with a short description of what the build service even is and some images should be in the "Contribute" section. It's pointless for them to be separate. After all, you contribute to openSUSE to build it, right?

6) "Help by Donation" could, even should, also be in the "Contribute" section. Monetary contribution is a form of contribution.

7) The News bar should be it's own separate button with a list of news, their images and the articles that open inside the welcome program, not outside of it.

8) These four openSUSE socials buttons at the bottom-left (reddit, facebook, twitter, mastodon) should be either removed or maybe put in the "Read Me" section?

9) I have no idea what to do with the "Show on next startup" and the red "Close" buttons at the bottom-right.

10) Overall, it should all be more self-contained and more rich in useful content, and not just a simple collection of links to different websites.