I completely deleted my sims4 save file.

@Lunanulee  What do you mean, you can't download custom content?  If the cc won't download at all, that's likely a browser issue, so try a different browser.

If you mean you can't install the cc, because you have nowhere to put it, start the game once and then look again for the Sims 4 folder.  Here's how to find it:

https://sims4.crinrict.com/eng/2018/07/how-to-find-your-user-folder/

You can of course look for your save in the recycle bin, or on onedrive.com if you've ever activated OneDrive on this system, but it might be gone for good.  This however should have nothing to do with your ability to use custom content going forward.