Yes, don't apply for anything else for the next 6 months. Let you current accounts age and don't let more than 10% report.
In 6 months you can apply for the QS or Discover or both. Capital 1 only allows one approval every 6 months.
Sidenote: Last June I apped for the secured Discover and was decline. 6 months later in Dec, I applied for the regular Discover (I was not preapproved and did not receive mailers) and I was approved for only 1K. It's now 7K (I haven't requested an increase this month).
Moral of the story, let your accounts age and show good payments and utilization, and you can turn denials into approvals 😀
There re is a thread in this forum called 700 in 24 months. If you haven't read it, you should. You will want to close your credit one card before the annual fee hits. IMO, sooner if possible (especially if you apply and are approved for QS and Discover in 6 months).