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hello /#/ I am a certified financial analyst and I work with, study, and believe in trends. All trends can be defined as going up, sideways, or down, and they always happen in that order, repeated as necessary. For a trend to be sufficiently analyzed it needs to have become formed over 6 months at least, preferably years, hence in the next paragraph I will only analyze fossilchuubas.
Once your oshi is done with the uptrend it goes into a sideways (currently Sora) then downtrends (currently Kizuna Ai), but if they let enough time pass and restart their career, they can go into a fresh new uptrend (currently Pmaru chan formerly known as Kaguya Luna)