I have a World War 2 cc request!

Consider applying (for free) to SimsFileShare where you can then link your Sims4 creations uploaded there to anywhere, such as on your own content thread here at Sims4Studio, or your own website.

It's easy on SimsFileShare to organize and compartmentalize your downloads, and you can share entire directories, if you want.

This is how I've organized mine, with nothing at the root directory. Everything is shoe-boxed:

I use SimsFileShare for here and my own site.

Image storage

If you do decide to use SimsFileShare to showcase your work here or on your own site, consider one of these two free sites for including screenshots: imgur.com and postimages.org
PostImages, at least for me, is overall a cleaner, less cluttered experience and isn't trying to be Pinterest. Both are fairly hassle-free as far as the image upload process.

You can also post directly—and for free—to The Sims Resource (TSR) and ModtheSims.info (MTS), both of which have self-hosting and index, archive, and curate your content for you, which is definitely a plus, especially since if you go the SimsFileShare route, it's more or less up to you to raise awareness of your stuff rather than letting another site do it.

I've never placed anything on TSR because they have an 8-swatch limit per Sims4 package. One of my magazine decor objects has 36 swatches. TSR sells mouse clicks, and forcing people to encapsulate their work across multiple objects with fewer swatches in them = more clicks. That said, some creators on TSR have download counts in the millions, and TSR does let you present all of a given set of related packages as a collection and people can download the entire collection of packages, but that still means sitting there creating multiple packages and keeping track of what you elected put in each, where in most cases, even with disparate content, one merged package would logically suffice.

The only time I break up mine is when the packages would otherwise be very large or there's a slight variety between bits of the content and people may wish to download only certain portions.

ModTheSims.info is a highly-trafficked site, and I've used them over the years, but more than once I've run into some mercurial and inane moderated rejections from them, everything from having lighting in a background screenshot too low to a folding chair being "too white" and you never win an argument with them. If a moderator there rejects your submission, they tell you precisely why and how to fix it, and give you a couple times to do so, which is what I've managed to do in the past—get an initial rejection accepted eventually. I only have so much patience for over-the-top moderation, though.

But that's a me-problem, so if your content is rated G, I still recommend ModTheSims if you want high visibility on your creations, and unlike TSR, I've never hit a swatch limit, and it's one of the best for tracking, at a glance, what of your stuff is downloaded most frequently. For example, this is a partial screen shot of my personal scorecard on ModTheSims.Info tracking a few of my uploads there:

To completely avoid the moderation hassle, anything I publish now is on nexusmods.com, including my creator templates. The trade-off is that Nexus is far, far less trafficked for Sims4 content than TSR or MTS (but they are the largest warehouse for Skyrim mods and thousands of other games).

Nexus has an excellent visual presentation of your creations, messaging system, and version control. It also has a desktop app to automate downloads directly into a user's Sims4 folder, but to keep things simple for people, I flag that option off and just have people select the manual download option. They know what to do with that. Nexus caps download speeds to 2mb/sec if you don't subscribe, but free is free (no cap on upload speed).

Tip:  Always include a by-line in each object's textual description. Doesn't have to fancy:

Once you publish something on the Internet, unless you're rich enough to afford a team of lawyers, you really have no control as to where your stuff winds up.

By including a by-line, people who download your creations will at least know who created that download even if the third-party sites don't directly credit you. Most do, fortunately.

Googling myself, I have found my Sims4 downloads all over the place, even sites whose languages I can't read. These third-party sites have either linked to other sites where I've posted stuff, such as ModtheSims, or have directly posted my uploads to their own sites (behind their revenue-producing ads).  Life's too short to get upset over it, though, and good luck issuing a take-down notice to content hoarders on foreign servers. I try to be zen about it and be happy that at least people have sites in their local languages where they can get my stuff. 

Hope this helps.