Propogating Wyeast

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I had a small amount of wyeast leftover from a brew that I put in a glass bottle.

Yesterday, I mixed a few tablespoons of DME with boiled water and added the small amount of yeast. Today, I can clearly see the residue on the bottom of the bottle has tripled, but the wort seems to be far too fizzy.

What can I do to keep breeding the yeast instead of accidently killing it off with alcohol?
let it settle and decant the liquid off the top of the sediment and ad some mare malt/water. try and get as much air as possible into it even if it means putting into a fresh (sterilised) bottle and shaking the piss out of it.