Definitely should check out this awesome free to play season based halo league! Premier Halo Championship League or PHCL It ran through 2 season in MCC and is now tackling infinite. Has a spot for all skill levels as there are different divisions of play as well as awesome tournaments! The community in the discord is top notch as well and always running custom games fun and competitive!
Discord information is below! Come check it out! Can also find the website and twitter if you google premier halo!