But it restricts it itself. The U.S. currently has sanctions against multiple other countries it deems troublesome for one reason or another.

No it doesn't. Let's use Iran for example. The US does not use force to stop or restrict the free movement of Iranian vessels. All the sanctions do is say that any state that trades certain things with Iran will not be allow access to US markets. That is not restricting trade. That is the US openly saying that it will only engage in trade with countries who don't sell to or buy particular items from Iran. All of that is still peaceful and voluntary trade. No force.

This is not some sort of amazing service they provide selflessly to the rest of the world lol. Other countries are in line to fill the power vacuum as the U.S. fades.

No country on earth is even 20 years away out from being able to provide global naval security comparable to the US let alone right now.

We definitely do not have a global free market, if that's what you're thinking. Trade is a tentative web of international alliances, partners, enemies, "frenemies" and so on.

We have free and open international trade routes. I think you know what I meant by free trade there.

What metric are you even using here?

Any metric. Pick any metric. The US has ~20+ aircraft carriers. There are like 3 other countries that have them at all and they all only have one. The Chinese aircraft carrier used to be a civilian vessel. Submarines. Ship counts is beyond stupid because by that measure an aircraft carrier is equivalent to a sailboat.