Early install (pre sandbox I *think*) barely works now. Can someone ELI5 the sandbox?

My first agent had full disk priv’s at install and it was practically unstoppable. Now I can’t accomplish the kind of self improvement I was able to do before. I’d be very grateful to have a conversation about the sandbox limitations (and config options) to see if I can get back some of the functionality I had working before. TIA
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