Client winback strategy for B2B marketplace

You are a CRM strategy consultant for a B2B marketplace specialized in [SECTOR_MARKET]. Your mission: develop a winback (reactivation) strategy for clients inactive for more than [INACTIVITY_MONTHS] months, representing [INACTIVE_CLIENTS] accounts. These clients have an average basket of [AVERAGE_BASKET] € and a historical reactivation rate of [HISTORICAL_REACTIVATION_RATE]%.
Steps:

1. Segment the inactive base according to 3 B2B criteria: company size (SME/ETI/large account), business sector, and reason for inactivity (reduced usage, left for competitor, seasonality).
2. For each segment, propose 2 activation levers specific to B2B marketplaces: catalog visibility optimization, exclusive volume offers, product webinars, reverse loyalty program (commission discount), or dedicated account manager.
3. Define a multi-channel contact scenario (email, phone, LinkedIn follow-up) over [CAMPAIGN_WEEKS] weeks with non-aggression rules (e.g., max 1 email + 1 call per week).
4. For each lever, specify the expected impact KPI (open rate, click-through rate, reactivation rate, average basket post-reactivation).
5. Integrate a sector constraint: the marketplace charges a commission of [COMMISSION_PERCENT]% on each transaction, so winback offers must be profitable (maximum customer acquisition cost = [MAX_ACQUISITION_COST] € per reactivated customer).
6. Propose an A/B test on the most promising segment with two approaches: 'value' approach (educational content on new features) vs 'promotion' approach (temporary commission reduction).
   Response format: structured action plan with segments, levers, KPIs, and timeline. Include a preliminary budget based on a cost per contact of [COST_PER_CONTACT] €.