How can I re-understand and re-enter this?
Yes.
Not much more to say, really. There are a lot of beautiful changes, and if you take them in with an open approach, you'll see how beneficial and productive they can be.
In the main site, under "Our Ethics" and "Liturgical Terms", you will also find 18 new Prayers that are incredibly potent. They will help you understand a much clearer picture of "our side" and what "the Enemy" always was.
As for "Zevism", well, this one should come as no surprise. Our community, even before its institutional foundation, always stated that there has simply been a vilifying of the Ancient Gods, and now the front-and-center identities are the proper ones. Each God Ritual in ToZRituals has not only been updated with far stronger invocatory tools, but has also had a "Goetic clarification" added, which will, with each Ritual done, help put the "demonic" faces of the Gods into full context for you. In the main site, you'll also find the Names of Zeus, these are great to study as well.
The Family of Zeus and the Advanced Zevist Philosophy sections of the site are an absolute treat to read, and you'll likely need to take your time with them.
New meditations were added, including an entirely separate Awareness Meditations section, which adds an entire new layer to our practice that, while present in bits and pieces if one was diligent enough to construct it, is now right in front of your eyes in a comprehensive way, with a plethora of new techniques to master.
I hope you have a great time here. Do look up the "Vultus Templorum Platform" as well, it's a new group where you can chat in a much more convenient way, and where Group Rituals and other activities are done.