You were out of the US for 4 years. You were questioned by CBP for 2+ hours when other, much softer administration was in office. You're almost asking for NTA by leaving again, pretty soon after reentry. The best advice you were given is to stay in the US until you naturalize. It's even more valuable piece of advice in these difficult times. If I was let back in after 4 year absence, I'd be the luckiest person in the world and lay low until I become a citizen. At N-400 interview, even without additional trips, you still may be asked about that 4 year absence.