Opening Credit Line

I know there is no definitive answer to the question but I am wondering, at what FICO score’s do people start getting large Credit Lines? My FICO’s are 658, 654, and 641. I havent applied for any new credit cards as I am waiting for my mortgage to be appreoved but the 3 cards I have now are all starter cards. $450, $420, and $275 credit lines. and a $1000 CL from fingerhut. My last W-2 showed 71K as my pay for the year. Any ideas?

• how often does finger hut give credit line increases