Here’s my idea for an Sg content update:
20 more levels = 50 total levels
New maps
New Gravestones
New unlockables
And Sg trios and squads
I know similar suggestions have been made in the past (not saying I disagree, I actually think these updates would be fun). With that being said I’m sure the staff have heard the pleas of the SG community for a while now and just need some time to decide what they want to implement.
They should add a update on this game mode and they should fix bug’s like the camp fire bug
Hey there 
Unfortunately, this is a duplicate topic. You can find the original topic to increase max level cap here: Increasing max level in Survival Games
You can also find suggestions about new maps here:
My ideal SG Update
Thanks for your suggestion though! 
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Duplicate Suggestion