usps.com won't open in Safari 16.3 on iPhone 12

I haven't been able to access USPS.com for the past month using both Safari 16.2 & now on 16.3 (after just updating it) using my iPhone 12 Pro Max. I can sign in right away with no problem to USPS.com using the Google browser. Safari won't even let me sign into usps.com. It just gets stuck trying to load just to sign in. I have used usps informed delivery forever & have never experienced this issue. I've tried signing in with Wifi and just using cellular data via Verizon without any success. Does anyone know a solution to fix this? I've tried restarting my iPhone, updating to the latest safari browser, closing the window and opening a completely new one without any success. I know you can clear the Safari history and website data but then I will loose all the many website open tabs I purposely have saved for easy access within Safari, which is a no go. I shouldn't have to choose whether I can access informed delivery, hold mail etc. via USPS.COM on my iPhone 12 Pro Max (which I paid $1500 for when it came out 2 years ago) via Safari 16.3 or loose all my open website tabs by clearing all the history & website data. And I shouldn't have to have the Google chrome browser just to be able to sign into one website. There has to be a better way in which this issue can be fixed without loosing all your open Safari website tabs. It's only happening on one website but a very important one, USPS.COM. Any help would be appreciated.