Can I safely delete all my old saves and tray files?

So I'm running low on storage and I was wondering can I delete all the saves in my saves folder except for the most recent save? Also, what can I delete in my tray folder without losing any data? These two folders take up a lot of space and I was just wondering if I can safely delete some things in them.

Update: I went deep into my sims folder and found that the biggest folder was in Contents->data->client So I'm now in the client folder and there's a bunch of "ClientDeltaBuild0.package" keeps going up in number. Can I delete these?

Update 2: I just found a folder called Sims 4 packs that is 45 gb big. I have 25 packs and about a month ago origin prompted me to redownload all of them. I don't know if they are duplicates but 45 gb seems a little big.