Just as the post title says, I would really like more Point Shop Profile Showcase levels being added past the current limit of most being Level 3, as well as adding another copy of the preexisting "Additional Showcases", which may further incentivize spending of Steam Points obtained from game purchasing, especially during Steam Game Sales. It would also promote increasing your Steam account level, either from the aforementioned game purchasing or from buying trading cards on the Steam Community Market and crafting badges from them). I would like to recommend increasing the current limit from Level 3 to at least Level 5, with each additional level after Level 3 increasing the total maximum slots for that Showcase section at the same rate it already does each level you upgrade that Showcase.

As a former TF2 Collector and a dedicated completionist, being limited to only displaying a maximum of 12 slots when I've completed nearly 3x that many is very restricting to the collective thousands of hours I've spent getting every achievement in these games along with future games I complete. I've had to resort to using the "Rarest Achievements" Showcases to display achievements showing 100% completion (some don't even have specialized achievements for reaching 100% completion/ obtaining every other achievement, but that's not a major issue since the Completionist Showcase lets you see which games you've completed via clicking on "Perfect Games". However, not everyone will do that, hence increasing current Showcase limit) to artificially increase how many games I can immediately display on my profile that I got every achievement in.

TL;DR, I really want more slots to display all the items I collected and the numerous games I've completed.