skyfactory 4 crashing

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Allocate more ram, 4-6gb

Perhaps try using Jar-launcher (also install the latest java 8 64-bit version) - might need to start the pack, then close and restart after the switch from native to jar (might start up as vanilla 1st time).
Instructions:
https://imgur.com/a/0wVhh
(open link, more than 1 image)

If you still have issues after that - contact mod pack author for support, as Skyfactory 4 is not a FTB pack