First, Welcome!
The larger pseudobulbs don't look great. Definitely don't divide or cut... that shoot is likely in response to the adjoining p-bulb maybe not making it, but it depends on the older p-bulbs for sustenance while it grows. the new shoot has zero chance of surviving on its own at this point.
As far as repotting goes, how does the mix look? if it is old or there is any odor, repot. That will also give you a chance to look at the roots, The timing is good, this is when Cyms are in active growth. Some things to think about:
1. Cyms like to stay on the damp side
2. They need very high light (like, as soon as nights are above 10 deg C or so, it will be much happier outside, and since sun angle is still fairly low, a good time to acclimate it to sun so that by summer it can take full sun where you live.
3. To bloom, it needs conditions in the fall that may be a challenge for you - warm days and cool nights.
Once acclimated, it can tolerate winter night temperatures of 2-3 deg C easily (down to -1 or -2 for short periods) especially if it gets warmer during the day (18-20 deg C) In summer, it can be happy with lots of warmth - 40 deg C won't bother it at all.
It is going to be a challenge to grow and bloom this under your controlled conditions if you are trying to grow it with other orchids that need a more even envirionment... Most Cyms really thrive on extremes.
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