Essentially the general view of the altright is that our high trust societies have been ruined by non whites

To be more specific, the West was ruined by the second world war. Europe was blockaded and bombed into rubble, invaded from East and West, and then occupied by Americans and Soviets who installed puppet governments. The Eastern states got communist regimes that stagnated their economies, while the Western states got ZOG regimes that deliberately undermined their foundations. After the fall of the Soviet Union, all the newly free Eastern states had a ZOG regime imposed on them. While all this was going on, Jews were quietly infiltrating the media, entertainment, and academia, changing the cultural milleau into something that was toxic to white Europeans.

In addition the altright believes that jews on some sort of genetic level spread social ills intentionally among the host population they parasite, for example alcoholism, pornography, homosexuality and feminism.

Don't forget cultural marxism, moral relativism, faux science, white guilt, race mixing, a toxic entertainment industry, etc. The list goes on. Entire articles could be written on each and every one of these subjects, and indeed, there have been. The Jews are a type of people completely unique in human history. They are the only ethnic group that evolved as social parasites, with the ability to infiltrate host societys and enslave them covertly.

would the general sense of anxiety and happiness that permeates our society be solved?

Not entirely, no. We would still have the problems associated with an evolutionary mismatch. Humans have evolved to live as hunter gatherers, thats the type of environment which is natural to them. Humans have adapted fairly well to life as sedentary farmers, a condition which has been stable for roughly 12,000 years. But humans have been struggling to live in the industrial age, and they are really struggling with life in the information age. There is a huge evolutionary mismatch, which is demonstrated by the huge rise in mental health problems.

I would still feel a sense of unease with millions of whites around, my brain evolved to deal with a few 100 people in my local tribe and no more

That too is an example of an evolutionary mismatch. What you are referring to is called Dunbars number. Basically, the concept here is that the human brain is built to know about 150 people and maintain some kindof relationship with them (family, friends, coworkers, lovers, enemys, etc). Humans evolved to live in small tribes, not in vast citys with huge population densitys. These are abnormal and unhealthy conditions to live in.

I don't think that fundamentally I would feel a sense of fulfillment in our current society. There's no modern job that I would feel happy doing

What motivates men to work? There are a number of things. There is the base necessity of securing our physical needs of food, shelter, clothing, etc. The desire to gain respectability and have a way of life. But also important is a mans desire to attract a woman. Civilisation at its roots is defined by the marriage contract, a compromise between men and women. Women agree to stay faithful to one man, while men agree to work hard to provide for that woman. When the marriage contract is broken, one of the main drivers for men to work is disrupted. After the sexual revolution took root, Western men are no longer sexually incentivised to seek gainful employment. Increasing numbers of men have dropped out of the workforce altogether, finding other ways to avoid homelessness or starvation.

Even without the jews or non whites in our borders, the world would still have oceans full of plastics, supply chains spanning the globe to feed billions of people, enormous industrial pollution

These things are products of Globalism, which is in its essence Jewish imperialism (with the United States as its base of power). They built the world into what it is now. This was not predestined. The most grotesque feature of all this is the shipping of vast quantitys of food into Africa, which enables that continents useless population to multiply into ever more unsustainable proportions.