Pretty much what I was going to say. I think the stamina podcast is also helpful. And don't forget to limit your increases to 10% (time or distance, it doesn't really matter), but do NOT run flat out on your longer runs. You should be able to talk while you're running, which is what is known as an "easy" pace.
Training for the 10k should help with bringing your 5k times down, too. Start increasing your distance on a long run each week. I've been doing the same as I'm building up for my own 10k run at the end of August. Good luck
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