Chicken Soup for the Soul is open for story submissions in several categories:
You can find out more here, including topic suggestions within each category: https://bit.ly/1DqrGQo
They have a lot more of these kinds of guidelines in detail, including what they don’t want, right here: https://bit.ly/2MQ4f2F
Here are some of their latest releases. Reading them will help you understand what exactly they’re looking for and increase your chances of acceptance.