Are there any plans to change collateral, increase it?
or make several levels.
A voting had just concluded for the BR Reduction.
https://github.com/SuB1X-Coin/proposals/issues/8ATM we're preparing the new voting proposal for the amount of Block Reward that will be implemented, should be out soon so everyone be able to cast their votes according to the amount they THINK is better for the future of the project.

Are there any plans to change collateral, increase it?
or make several levels.
BTW There's a new proposal that one of our community member created towards that, the collateral, if accepted/passed, will be send out to Vote. Feel free to go there and share your thoughts about it.
https://github.com/SuB1X-Coin/proposals/issues/9