Cydia Impactor won't sideload
There’s bug in the Apple’s servers so you could use totally not spyware jailbreak. 

g0blin is not the only way to jailbreak at iOS 10.3.3. There are doubleH3lix which is developed by tihmstar (same person made H3lix too).

Also there is website called https://totally-not.spyware.lol/ can enable you to jailbreak without sideloading app.