I want to see NEW Badge in Clash Royale… Example:- Boat Attack Badge in caln war…
It would be amazing to see new game modes in path of lengends. Also, being able to change the background/arena in path of legends
In my opinion, the Clash Royale team should add a customization option for each troop. While star levels primarily affect a specific aspect of a card, players should be able to customize the appearance of troops, alter the color of spells, and enhance the visual appeal of buildings. Also F2P players could have an option to get something like a silver pass from the season shop in which the players can unlock specific rewards for playing a lot in each event. 
I liked the concept of the Goblin event where free cards where given through grinding. It makes the game have multiple choices to play rather than trophy or path of legends ladder. I would love it if the HQ can think of multiple ways to add more ways for players to get rewards through grinding if the Goblin event will be replaced. I can suggest a theme of mini games like sudden death or other things that has a high statistic where people enjoyed it so they could grind it more. Of course the rewards should be as appealing as the Goblin event! 
Thanks for listening to our suggestions supercell!
A tournament level ladder. All cards stay at level 11 no matter what so regardless of your card level you can climb the ladder. With a ranked leaderboard same as path of legends with tournament standards.
I would like to see skins for cards! I think that would be so cool
Improvement in star points, they just stack up and serve no purpose to maxed players.
Clash royal need to add more way to obtain " gem ",
- like by " trading " some amount of gold or other stuff
That would help a lot.
3v3 battles in the future
As F2P player, this game need more discount event but not as Clash Slash Event thing! But you need to spin between 10-75% discount(Can be changed!)
And 2nd option make Mystery Shop(Like free fire) And there so many things you can buy like season shop but with gold & gems
Please add the triple play feature.
Maybe tower defense-ish style game modes? 
guys I think class Royale have to focused on clan war section I think it can be more interesting. there is some bug in the clan war. there is so many unfair matches like level 9 versus 12, 10 versus 13, 11 versus 14. I think if you fix this issue and add some interesting feature in clan war it will be more interesting otherwise clan war will be boring.
there should be new ways to get lucky drops. although most of time theyre trash, if youre lucky enough you can save many weeks of progress, or even months. I’d consider adding em as rewards in challenges, the season pass, trophy road, shop offers, PoL… maybe the chest rotation would be an option too. as a F2P player, i thought since their launch they are a really good way of progress (if youre lucky, as i said), the problem with em is that you can only get ONE PER DAY. if we could get more, it would improve a lot the game experience
Clash Royale should focus more on clan war. The reward should be increased and top 3 players of clan war should also get some extra gift. So, the competition of clan will be increased and will have some fun too.
Can I be selected for giveaway please
Maximize the map, additonal bridge in the mid
I would like to see more ways to get evolution shards, putting them in challenges would give more incentive for people to participate in them
i think that the clan war mechanism is very useless . i would love to see another (serious) rework on it .
I would like to see more ways to get wild shards/evolution shards. Putting them in challenges or even path of legends would provide more incentive to play these modes. They’re also very difficult to obtain now, with every season adding 1-2 evos while only being able to purchase 1 shard in the season shop. Or simply increasing the odds of them appearing in lucky drops, and adding them as a loot option for rare drops as well.