You can not change the Platinum to the BBP. You’d have to simply apply for it.
To to be honest, you probably applied for the worst card in your situation. The Platinum is really not a good card for daily spend. It’s a card meant for travel perks that comes with a hefty AF. Recouping the value of that AF is impossible to do if you don’t travel (including flying) often.
The goo news for you is as the Plat is a charge card and the BBP is a revolver, you can easily apply for the BBP and while never guaranteed I say the odds are in your favor to get approved. You can app for 2 revolvers within 5 days of each other and in theory unlimited charge cards. Just no more then 2 revolvers within 90 days. So go for it should be all SPs from here on out.
I got approved for the BBP with a whopping $2,000 SL. I tried to see if the representative could somehow increase it to atleast $4,000 but stated it was up to the system. I’m surprised they would start me that low but I’ll have to work with it for now.
you can try once you activate the physical card or after 61 days... some can do it right away, some have to wait.
I app'd for the BBP and Amazon Prime within a week and the Amazon card was 2k lower than my BBP SL, but like creditaddict said, you can always request a CLI after a couple of months of use.
Requested a CLI and got the 7-10 day message
That's typically a decline, unfortunately. Just give it time and try again at the next CLI opportunity.