Import/export professionals, what is your preferred sourcing method?

As a beginner, I find platforms like Alibaba challenging due to varying product quality and manufacturers' lack of foreign trade experience. Other platforms like Europages and Tradekey are industry-specific and may not suit my needs. For experienced Buyers, how do you usually find new suppliers? Here are some ideas: 1. Hiring a sourcing agent, though this can add communication costs. 2. Using procurement software. 3. Leveraging personal networks and industry groups. Any other suggestions? Hope your reply