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You have a young and thin file so Sync is a lot more unpredictable there. It's worth a shot though. It's a great card and it grows quickly.
Synchrony gives great weight to TU08 scores an yours if fine. Id say you were gtg for a $1000 SL, just my guess of course
Good luck
You have a pretty young file like mine. I was approved with 2 years of history with 2 cards though. You have 4 accounts opened in 6 months that might spook them, but I'm leaning towards approval, just not a high SL. I still can't get them to CLI my card after a year, shown zero love and every time it was because "Too many new accounts" and I only have 3 accounts this last year. 1 is a credit builder charge card.
I think you should not get any more credit at this time. Two of the CCs that you are financially responsible for are retail. IMHO, you should wait until your Marriot is at least 6 mos old.