One for all and all for one - 2

1) free team formation, not based on tiers;

Yeah. And a handicap based on the average rating difference between teams. Plus, extra restart days, the right to freely choose a color/template/castle, etc. So that players don't assemble a dream team...

2) increasing the team size to 7(9) players;

Based on experience, 5 max, otherwise it will turn into chaos. And even better, 4 players in the field + 1 substitute.

3) crediting each game in the overall result, not based on the majority, i.e., the score is not 1:0, but 4:3, 5:2, 6:1, and even 7:0.

Debatable. Players often don't finish games that don't affect the match outcome.