Here's my 5 suggestions;
First, take a look to mixmaster and make it fair.
Second, fix the bugs commonly used in specific maps.
Third, add massive raid battles with many players.
Fourth, add some diversity between knights for their play style.
Fifth, more end game content "without creepers ofcourse because they are so annoying... ".

What would be your 5 suggestions to future of SK, please share your ideas in below! :)