Make sure you're inviting good players to your group with Mythic Plus Helper.
Step 1. Install the addon
Step 2. Start or join a Mythic+ or Raid group and type /mph to copy a full list of your group's applicants and party members
Step 3. Paste the MPH string anywhere on mythicplus.help to get relevant info and stats about every applicant and group member
Step 4. Crush that keystone!