1) First of all I think weapon slot upgrades should cost more, like 1kce for example, but these would last forever.

Would definitely be something I'd love to have, although I imagine Three Rings is quite happy to have people repeatedly drop energy into the system on a monthly basis so not sure if this will ever see implementation.

2) Mist tanks sometimes can be really annoying so I thought you should be able to buy bigger mist tanks or something like that that can hold more mist. Additionally you would be able to buy a generator for it which speeds up the mist that is generated.

This would kinda hurt the energy market a lot. Three Rings relies heavily on player reliance on buying Crystal Energy and so any suggestion that reduces that reliance is going to need a lot of convincing to get past the devs. I don't think stating the mist limit being annoying is going to cut it.

3) I strongly disagree with the payout of blast network i think they should be way more like in team if you win you get 500 crowns. So in free for all first place should get 1k crowns, second place gets 600 crowns and third 300 crowns.

The prize pot of the PvP modes is made up of the combined entrance fees, minus a portion of it so the modes can act as a sort of crown sink. Thus the only way to increase the reward payouts would be to increase the entrance fees. Which sounds bad so I think it's fine as it is.

4) Maybe you could add pets to the game but maybe later on because you know how it lags currently so that will just make it twice as worse.

I guess this might be cool for the crowd into virtual pet simulation and all that. Just as long as they don't go crowding the Havens and the like.