Split it: £30k into Market B paid social, where marginal return is still above the portfolio average, and £20k into Partner Group C, where incrementality-adjusted ROI is highest in the programme. Hold brand search - it is past its saturation point. Creative 04 can carry the extra social spend; Creative 02 is fatiguing and should not.
Used: ForecastingUsed: Affiliate GrowthUsed: Creative