The second category: some daily necessities for men, women and children, such as socks, soap, laundry detergent, hand sanitizer, etc. This kind of products do not have a single customer group like masks, but face all customer groups, no matter which group you are, you usually need to use this kind of products.
The third category: seasonal products, the most typical of which are zongzi on the Dragon Boat Festival and moon cakes on the Mid-Autumn Festival, as well as hairy crabs in late autumn. The characteristic of these products is that no matter which consumer group wants to buy at that time, they have a very wide audience.
The fourth category: cost-effective products. If your product is of good quality but cheap, it can basically attract the attention of various fan groups. Even if he doesn't usually buy such products, he will be tempted to see the high cost performance of your products. But if you want to sell this kind of products, you need to find suitable sources, such as products cleared by some manufacturers and so on.
The fifth category: some novel products, products that can stimulate people's curiosity and love. These products may have no practical use for fans, but after reading them, they just feel novel, fun and like them. Then such a product can also open the sales of all fan groups. Whether it is useful or not, as long as it can stimulate fans' desire to buy.