Hero roles and account goals
Tiles Survive heroes are useful only in context. One hero may fit combat, another may help gathering, and another may matter for a temporary event. Start with the question: what is currently slowing the account down?
For resources, look at economy and squad efficiency. For defense or combat, survivability, damage, control, and lineup fit become more important.
Why fixed tier lists age quickly
Tier lists can become outdated after balance changes, new heroes, or event shifts. Without current in-game data, it is not honest to rank every hero in S/A/B/C and claim it works for everyone.
Read current skill descriptions in the game, compare the hero role with your goal, and check upgrade costs before spending rare materials.
Upgrades and team composition
Avoid spreading resources across every hero. Pick a few useful directions such as combat, gathering, defense, or event play, then improve them consistently.
Evaluate a lineup as a whole. Roles should complement each other instead of repeating the same function without purpose.