Let me start from the middle.
Iran didn't fight "Arabs of Iraq", Iran defended against a full scale invasion by a Ba'athi regime in Iraq with a coalition of 32 countries including NATO members. As for "Arabs of Iraq", I'll just drop a name: Badr Army The Iraqis who fought for Iran against the Ba'ath dictatorship regime of Iraq.
As for the usurper Aliyev, he knows better than you that his regime will be wiped out in a matter of 5 to 6 hours (and I'm being generous here). There are only 32 strategic targets to be bombed to cripple his regime entirely. And Turkey is too weak and too busy to want to risk getting in the way of a super power at Iran's level, not to mention that he won't have any time to even react as I said the entire Aliyev regime will be wiped out very quickly.
Now as for United States, I will only mention 2 operation:
1. Operation Martyr Soleimani
On 3 January 2020 Trump broke international law and ordered an Act of Terror to assassinate an Iranian general on a diplomatic mission in Iraq working on coordinating the war on ISIS. After the terrorist attack carried out by US airforce, Trump started threatening Iran that in case of any action against US he will strike Iran (52 sites to be exact).
On January 8, 2020 Iran bombed the shit out of 2 major US bases in Iraq eliminating over a hundred US servicemembers.
For 2 days Trump was nowhere to be seen and after this period of absence he came out of his bunker to say "everything is fine"
2. Operation True Promise
On 1 April 2024 Israel carried out a terrorist attack on a building next to Iranian embassy in Damascus, Syria.
Those who have no idea about Iran's military strength were saying the exact same things as you. Dumb things such as "Iran is alone, Iran will be attacked from all sides, etc" if Iran responds.
On On 13 April 2024, Iran launched the largest missile and drone attack in history against Israeli positions. All ballistic missiles and most of the other projectiles went through and hit their targets despite the full NATO defenses that were involved. Nevatim Airbase which was and still is the most protected place on earth was demolished alongside the secret spy facilities in the Sheikh mountains and about a dozen other bases were damaged.
Same as before, this time Biden was nowhere to be found and eventually he said the same "everything is fine".
So yeah, you can believe the garbage the usurper Aliyev feeds you, the reality of this world is entirely different
As for the 5th fleet, the bulk of it has already escaped and is currently hanging out far away in the Indian Ocean. In case of a war with Iran, not a single NATO vessel would remain afloat after the first day or two. They know this very well which is why they've evacuated the region.