Re Eldritch Blast, it deals force damage. Normally, this force is invisible. But a mage can manifest this force by various methods and appearances. As such, it lends itself to various flavors of visualizations.
For various reasons, I arrive at the following viewpoint.
Force is the fifth element. Where the other elements (earth, water, air, and fire) are states of matter (solid, liquid, gas, and the plasma of sun and lightning), force itself lacks matter and is immaterial. Despite lacking matter, force is physical and affects the elemental matter of the physical world.
Force especially includes gravity. (It also includes magnetism but for thematic reasons I let this be part of plasma and lightning.) Flight and telekinesis are physical manipulations of the force of gravity, pure force.
The fabric of space-time, whence the tapestry of fate, is made out of force. Thus force damage can result from warping fate and making timelines dissonant.
As the fifth element, force and ether are the same thing. The ethereal plane is made out of immaterial forces, normally gentle and sometimes passing thru matter but sometimes a force is strong enough to push, fly, and manipulate material objects. Hence if the mind of a ghost is strong enough, the ethereal ghost can manifest noticeably by means of the force that its mind is made out of. The ethereal plane is actually a normal part of the material plane, but its activities normally go unnoticed by human senses.
The fey and shadow are frequencies of ether, namely positive and negative repectively, and like the rest of the ether, are also aspects of the material plane that largely go unnoticed. The fey and shadow ethers can view the material world that they are part of, but their frequencies distort the perception of it.
Within the ether, ethereal creatures perceive and interact with each other normally. Their virtual bodies made out of force often look and behave similarly to material bodies.
The seat of consciousness is an aspect of force, not matter. Thus in a sense, the "soul" or the presence of a mind is made out of force. This mindful ether is often called "spirit" in the sense of the stuff that souls are made out of. A ghost is the etheral presence of a mind, made out of force, thus some times called a spirit. In other words, the ethereal plane is the spiritual world, and is part of the material plane.
The body made out of matter is somehow able to entangle the ethereal forces of consciousness, thus able to become a conscious material creature, such as a human. Some humans whose force of mind is strong enough can project their mind outofbody. Normally this disembodied mind manifests a virtual body made out of force, to travel ethereally, and is defacto like a ghost except typically neither the fey nor shadow frequencies.
The mind can telekinese material objects because its seat is itself made out of force. A strong mind can influence and manipulate heavy objects, distort space-time, and telepathically engage other minds.
Because of this nexus between consciousness and matter via force - a mind willing reality into existence - the force, ether, mind, spirit, existence, are also the same thing as the "Weave" of magic. Magical energy, force, telekinesis, ether, and so on, are all them same thing and a construct can be made out of it. A constuct made out of magical energy and a construct made out of force are the same thing. Creatures that are summoned physicalize as temporary constructs made out of force that serve as a kind of avatar for them.
Force is the GUT (Grand Unification Theory) of all D&D traditions!
Because force is itself a mysterious and wondrous aspect of D&D tradition, there are many different flavors available to describe force damage narratively, including:
fate warp, curse, temporal dissonance, telekinesis, spiritual attack, conjured apparition, planar warp, teleportative disruption, magic missiles, etcetera.
All can deal "force damage".