To make it simple... either crates or crate keys need a buff on survival.

To a new player, voter keys and common keys seem like a fair and balanced key, but to a veteran player or someone who plays a lot, they are just a waste of time... why? Cause everything in them is something they most likely already have. I cant speak for all the people who play a lot, but me personally I can say, voter crates and common crates are garbage. The only thing I hope to get in them is the next level crate key. Now I get it... they are the low tier crates so they aren't supposed to have anything very good in them, but I don't really have a problem with voter or common crates, its the rare and legendary crates I have a problem with. First off to me it seems that people who don't play mineverse at all get way luckier with keys, like there was a day where 6 people logged into survival for the first time, voted, and got rare keys, then logged off... like I play survival so much more often and I've only gotten 1 rare key (from voting). Speaking of my votes... I've voted 125 times and I've only gotten 1 rare key and 1 legendary key. I'm not complaining about how often I get rare keys and legendary keys though. What I don't like is that I've waited 2 months for my first legendary key... to get kit titan... which is basic diamond gear... Two months, for diamond gear... that's absolutely stupid, if it was at least enchanted gear, that's different. My problem with the crates is that the bad stuff in the crates take up like 90% of the crate, for example in a legendary crate, you can still get coal (which is the worst thing obviously) what player wants to vote everyday and wait months to get lucky with a key.... and get coal... nobody. I'm not saying "everyone should be winners and get the best item" I'm saying that the bad stuff in the higher ranked crates, need a buff. Stuff like coal, and redstone should be removed. The armor enchanted and the iron, gold and diamonds should be doubled.

Fix the keys. If the crates aren't gonna get buffed, then increase the key chances. I'm not saying a legendary key every two weeks, but rares for sure could use a buff along with legendary keys, legendary keys should be as rare as rares are and rares should be between how rare rares are now and how rare uncommon keys are. This is of course if you don't want to buff the crates. If you buffed the crates and increased the keys, that would be broken. So its one or the other.

Some possible solutions. I've said a lot of these before but i'm gonna say them again.
-Buff the rare and legendary crates with the follow. Take out redstone and coal from them both, enchant the elytras with mending, and unbreaking 3, replace the kits with enchanted diamond gear, maybe add more spawners (like chicken, rabbit, sheep) double the amount of diamonds, iron, and gold in each. Maybe add extra enchants like fortune 5 picaxe, looting 5 sword, protection 5 armor
-Increase key chances. This is simple, make rare and legendary keys more common.
-Increase key chances over time. My personal favorite. That 100 vote reward that you never get when you type /rewards? Well what if once you reach it, you receive legendary and rare keys more frequently. Right now its a 1/250 chance of legendary and 1/75 chance for rare, what if once you reach 100 votes it goes to 1/175 chance for legendary and 1/50 chance for rare. Then the 100 vote reward goes up to 200 and once you hit another 200 votes, the chances go down more. If not doing this permanently then maybe every time you reach 100 votes, for the next week your chances get super increased, but only for the week. Chances would be like 1/100 chance for legendary and 1/25 chance for rare.
-Make crate keys buyable in game or in server shop. Probably the owners favorite solution cause it involves money! Skyblock legendary keys are available in the server shop... why not survival legendary keys??? Or maybe sell them in game at spawn for like 750k each?