For Cameroonian importers, the practical friction usually sits at the payment stage rather than the platform itself: Alibaba and AliExpress support standard international cards and bank transfers, but 1688 is built around Alipay and Chinese bank accounts, so a 1688 purchase from Cameroon almost always needs an agent or forwarder to bridge the payment and the shipping leg. Route freight from any of these platforms toward a consolidator who ships to Douala, and confirm with your bank in advance which of these payment methods it can process and whether the transaction needs to be domiciled. Because scams targeting African buyers specifically sometimes involve fake 'clearing agents in China' who claim your goods are stuck and demand a further payment to release them, remember that legitimate customs and clearance fees in Cameroon are paid to your own local broker in Cameroon, in Cameroon, not to an unknown party abroad.
Your country: find which of these platforms support payment and delivery to your country directly, and which local agents or forwarders your country's importers commonly use to bridge the gap for 1688-style domestic marketplaces.