I think the game now is became very OP. And i think the following could be solutions:
- it need to improve the game defense against the cheaters. (time limit loss, cheaters see your facedown cards, they always farming with 8k+ points...)
- need to make a "only one copy from each card / deck" championship.
- balancing the duelist skills. Same of them are too OP. Remove them from ranked duels or make another championship without them.
- do not add more OP cards.
- quickly add a counter cards/decks against the current OP meta deck, being careful that they are not to be also invincible.
- in the future Konami have to think about the game ballance before they add more cards and boxes.
Only ones who will have different opinion than him are Sylvan players, to be honest.
Even well-known players in the West and champions in Japan agrees the meta right now is ridiculously stupid due to Sylvan, and if Konami doesn't do something, the game will only die because of it.
Honestly, more than specific fixes, I feel that Duel Links needs to make balance changes each month, or at least, check the game's health each month. The current game meta is not Sylvans, nor Masked hero, nor Sea Stealth Attack. The current meta is "Coin-flip meta", a meta where you toss a coin at the start of the duel, and it defines wether you win or lose. There's little to no room for skill.