I open it every now and then to release the pressure and put it into the fridge after a week or so.
That said, the jars are maybe not ideal, but it works good enough for me.
I'm following this recipe. Unfortunately, it's German, but translate should save you.
It's quite simple, as I also never did kimchi before. Just be care full with the amount of chillies. It says 40 g but for what I can get in a German supermarket that's a bit too spicy. I found amounts between 15-20 g ideal.
Don't know if it's traditional, but for sure it's tasty.