Hello Zak!
The best way to get started right now would be by picking up the 2017–2020 Yearly Compilations, which are available both here and on Gumroad. You can find them by searching for the word "compilation" on my landing page, or by browsing directly through my gumroad shop (same username: @aekashics).
As for the rest of the content, it's available as standalone packs—either through the same link, or by joining my Patreon, where you can also claim them this answers to a change in my distribution model around that time period!