What's the best way to have nobody join a public session lobby in Grand theft Auto online?

I'm trying to sell CEO stuff in GTA but I'm getting sick and tired of cargo griefers. I know  there is a setting that you can do that will put ur MTU down it's recommended to put it down to 850 instead of 1,500 but it seems when I do 850 people still join a session is there any other way to have people not join the session or will people eventually join the session? 

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