Thin Credit History

[newhis]

My first TU score was 731 with 2 cards and 2 HPs on TU (both cards open same time, score after 6 months).

DW score started at 720 with 2 cards open for 6 months, 1 open for 2 and 1 open for 1 (don't know if this last one reported before the score) and 4 TU HPs.

The problem you have is that you only have positive payment on 1 TL, but have 3 accounts that will grow your AAoA and help build your credit. I'll say go for 2 cards after 6 months, consider Amex, check prequals, then wait for 6 months and open a couple more. 

After only 1.5 years my DW and I have cards with good limits (more than 5k and few more than 10k).

Some people recommend a secured loan, to help the mix on your profile, if you want to consider it. Good luck.

[washington12]

I'd say wait a year before capital one. I just got approved for 10k for their venture1 and my average age is barely over 2 years so I don't see why in a year of good payments and nothing bad on your report you couldn't get approved. Although I dI'd have 5 cards at the time. Anyway I'm cautious maybe over cautious, but I hate to waste inquiries without results