By the very process of thinking, of 'cognition', we create alienation: we create a reality in which there are 'things out there' and 'me in here'.
We then make the mistake of believing that what we have actually created by our thinking is true reality.
We then then alienated - either we assume that the things out-there are real and our inner life a subjective illusion (i.e. mainstream modern 'scientist' materialism); or, sometimes, that the inner me is real and the outside world an illusion, a creation of the mind (i.e. idealism or solipsism).
Alienation is an intolerable situation - so we seek escape in trying to stop our awareness of the consequences of thinking - by various means: we can try and stop thinking, perhaps by intoxication or ultimately by death; stop ourselves being aware of the alienated consequences of thinking, by distraction (compulsive socialising, mass media, novelty etc).
Sometimes, occasionally, someone confronts alienation - and tries to solve it.
And it can be solved, indeed it is solved - if we allow it. Because what thinking takes-away, thinking can also restore...
Thinking breaks the world into out-there and in-here; and then recombines the two into more thinking. That is, indeed, what most of our thinking is.
If we stop supposing that the splitting caused by thinking represents reality; and instead suppose that the recombined outer-inner world of our actual thoughts is actually a restoration of the wholeness of the world - then the problem of alienation is solved.
What this entails is that primary reality is in thinking.
Primary reality is not 'out there' - it is in thinking. Thinking is what re-combines reality into unity - it is both objective (out-there) and subjective (in-here) - thinking is the whole-thing.
Thinking is therefore the real world - and as such it is not merely-subjective but thinking is instead objective and universal.
Ultimately, it implies that human thinking is part of the divine plan- that our actual thinking (yours and mine) is potentially a co-creation of reality...
(Potentially because our minds are typically clogged with false thinking, pseudo-thinking, self-contradicting-thinking, automatic 'mental processes' into which we are trained and duped... the purpose is to think properly, do by aiming-at-it deliberately what we were intended to do spontaneously but have self-sabotaged.)
At any rate - the answer to alienation is in our own hand - or rather in our own minds; and at some level and however imperfectly we already do it. It is a matter of recognising, becoming more aware of, clarifying, strengthening making habitual what we already spontaneously are doing.
(Note - the above is a re-explanation of Rudolf Steiner's primary insight found in his early philosophical books - leading-up-to The Philosophy of Freedom - 1894.)