Cannot upload lots to the Gallery

I forgot to ask, is there any way to save my library on my MAC so I don't lose them again if I am having to uninstall/reinstall for the THIRD time?

Thx, I copied and pasted the Tray from the sims 4 folder and placed it on my desktop, and added that to the actual one in Cloud. I took out the sims 4 folder and put it on the desktop Lil bit ago as a suggested "fix" saying that maybe generating a new sims 4 folder and placing a few of the folders w/in it (saves file among them), however, it didn't help it and of course, took out my library in the process, so at least those in the library on that desktop folder might be saved via your tip.. 

As for the main issue I have been dealing with regarding getting my builds onto the Gallery. There are no error messages. It's simply in a perpetual state of upload. Never stops trying (ten minutes and it was still going) til I have to Force Quit the game. I have no MODs, no CC, and have uninstalled/reinstalled, repaired the game multiple times now and nothing is working. Even EA couldn't get it fixed. I didn't have this issue until I got the Dream Home Decorator Pack and I added CC to my original game. I did, however, delete every bit of CC and lost all my library contents when I initially uninstalled my game the first time. I reinstalled the game without any MODS or CC and it wasn't working and placed back the saved games I had on a folder on my desktop. That didn't fix anything and tried getting help with EA chat who advise me after over an hour of trying to fix the gallery issue to uninstall/reinstall the game again. This time I cut my losses and did not put back my saved games and started the entire Sims 4 from scratch! ... And it didn't fix the problem :-<  I have today, as stated above, used the repair game option and took out the Sims 4 folder.. but still, the problem persists, and can't upload a single thing to the Gallery. I honestly don't know what else I could do to fix it at this point. I've tried everything multiple times. 

I did actually load a new game and try it but I was still having issues with it. I also ran the reset tool and still having the same problem. I'd like to see if maybe uninstalling just the Home Deco pack would help as I only had this problem when I downloaded it in the first place. (I have a Mac) But that would require me uninstalling/reinstalling it all over again and that takes all day. Plus, when I tried not downloading it eventually did it automatically without me realizing it. 

Well, I went and uninstalled/reinstalled it again. I did not add in anything from the old sims4 folder and started from scratch again.. I even clicked off the Dream Home Decorater Pack so is wouldn't install. I loaded up a new game and wouldn't you know... Dream Home was installed regardless. I even had made sure it wasn't in the queue either but it still installed. I created a new person went to an empty lot and built a shell with a couple of counters from Home Deco just bc (?), anyways I tried saving to the gallery and it STILL won't load. However, I get an error message "Server error. We could not process this Gallery request. Please try again later." I'll try James's tool and see where that gets me. 

@BluebellfloraI disabled the Dream Home Decor pack using the way you suggested and started another new game from scratch. Went onto a lot and built a shell of a building and saved it to my library. Tried uploading it to the gallery and it's still currently trying to upload. Essentially, I now need to Force Quit the Sims 4 because I know it will not stop trying and I still can't upload anything to the Gallery. Btw, this time I'm not getting an error message like the last time. Though, whenever I try to get to the gallery it asks to connect, which I do then click to upload...

Even when I managed to get the Home Decor pack off I still had the issue. I tried the tool again as I had done yesterday as well and didn't help. Today I could hardly get the game to stay online long enough to try anything. Can't see how this will ever get fixed at this point. Nothing works and having lost all of my original builds in the library from the first uninstall/reinstall I'd give up and just stop playing altogether if it weren't for all the time and money I spent already on this game. Even EA Help couldn't help me fix this... I don't have time for this S#$^!! 

Thx for trying to help, btw, I appreciate it.