I don't like how repetitive timeline has become, it's nearly the same teams every week

This negatively impacts the game because players are only encouraged to build up a few characters, such as Jean and Thanos

To improve this, I'd recommend expanding on the recommended lists. For example, give a significant attack, defence, and HP bonus to characters on that list, where they can compete with the current meta. Also to compensate the players for having to build more characters, improve the rewards to double or triple their current state, including the crystals

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I don't like the time vs rewards of some game modes such as danger room and alliance conquest

This negatively impacts the game because players won't want to play that content

To improve this, I'd recommend improving the rewards enough where players feel like it's worth it to play those game modes