As a medium, I have been given visual spirit sightings of a great many more than a few people in my lifetime from some years ago---and these include people who are either passed over or who are here but visiting in the astral state (as in astral traveling to me).
The first one was my 2nd ex-mother-in-law. She had always been on the quiet side and rather aloof. After her passing, she came to me in the astral plane and showed me that she is my step-daughter's spirit guide. Nice. It was somewhat shocking at the same time because she somberly looked me straight in the eye as if to make sure I saw her role in the passenger seat of the girl's car. (It is always interesting to me how the person's spirit or higher self can spot people who know truths about energy only changes form and there is no real death and also those who can see spirits. They flock to us.) This lady fought against me in her later life but this little visit was almost like a capitulation from her. She was forcing me to see what she was doing these days, after her passing. I'm not sure I like being forced to see someone. Long ago I put up a shield against that. But I bless her, and I see that she was somehow acknowledging my work.
When you have the "light", the spirit world seeks you out. I have come to learn this via my visits with spirits these 30+ years, or since the early 90's, that no matter your belief system, if you tune in to spirit often they readily visit you when you don't even ask. If you're prone to visits you don't want, tell your guides and angels that. If they are negative spirits line up salt in front of your doors and windows, sage the space and if needed even put lemon juice crosses on your windows with your fingers. It's like you have a "welcome" sign over your head! So only welcome in those who are benevolent!
Another example is an astral experience I had wherein I thrust into a room I vaguely remembered from my youth. It seemed so in order to have a brief visit with a living person's higher self. We never really know what our higher selves, or future selves, are wanting to teach us. These so-called lessons are generally geared towards a forgiveness experience. Although I don't remember what I had to forgive, nonetheless, there was something underlying there that apparently needed fixing. There was a very peaceful and happy feeling in the short visit.
I astral travel all the time. I've noticed that it has really increased after storing my special Kyanite bracelet in a pyramid.
So here is the example of forgiveness. The 4th density is here already. It is enabling us to "see" on a more regular basis, should you wish to embrace it. It's an energy of transparency to truth. There can be no more lies. No more untruths. No more hidden feelings, hidden agendas, and no more duping the public.
So, after entering 4D and on our way to 5D, we simply must forgive. That is the key. Bless them on their way. "Bless them on their way for they know not what they do." Jesus
The day will come when the critical mass will be raised high enough in frequency to ring in the shift into full fifth-dimensional consciousness!