Love Live! School Idol Project, Free! Recommendations
Both Love Live and Free! explore the assembling of a club that does not exist in the school.
One for the sake of the school to not disband, and the other just for the sake of competition.
Both strive towards a common goal (winning Love Live/swimming tournament) and explore the friendships between the characters in their journey to achieve their club goal.
Both anime are about a group of diverse characters that come together to create a group (an idol group in Love Live, a swimming team in Free!). These characters face various challenges that help them to grow and improve together. While not everyone who enjoyed Love Live will enjoy Free!, I recommend giving it a go.
A group of friends working together trying to accomplish a goal. Both great shows about friendship, growing, and competing.
(This recommendation pertains to both the 2 seasons of LL and Free)
Focusing on the slice of life aspect, both shows start with the premise of getting together with other diverse characters to achieve a common goal. Later on in both series, the goal becomes clearer that the "groups" want to do something big (winning Love Live for Muse and doing a relay in the nationals for the Iwatobi Swim Club) for it could possibly be their last chance to do it together.
Both series started off their 1st season as lighthearted and comedic whereas their 2nd seasons were unexpectedly filled with drama, hope and inspiration.