sourdough starter coming back to life

i made a large batch of sourdough starter about 6 months ago (or more?). i put it in to two jars and it's been in the fridge since then. what is the best way to bring it back to life quickly?

pour off the liquid, discard some starter and start over? or pour off liquid and just start re-feeding it? how long do you recommend taking to feed it before using again? other thoughts?


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