Why is there no significant anti-gravity research these days?

Diamagnetic levitation. Not antigravity.

define antigravity

A force which affects all forms of matter and energy (including light) proportional to the energy (including energy bound up as matter) within them.
Except it pushes where gravity would pull. Oh, and it's a conservative force. A body traveling in a closed loop should return to its starting location with neither more nor less potential energy that it started with.

There might be a loophole in that. A 5th force is possible. But that definition will do for now.

Because physics is closed for now. There will not be any more meaningful discoveries in your lifetime.

Everyone with a half decent prototype has already left this planet behind.

so why "Diamagnetic levitation" is not anti-gravity

Why wasn't physics closed last year, before the detection of gravitational radiation?

I suppose you're going to argue "meaningful" now. Reminder Lord Kelvin thought physics was a dead subject; everything was understood -- except for two tiny issues having to do with Maxwell's equations. Those unimportant details turned into quantum mechanics and special relativity.

That was anticipated. It just confirmed an existing theory.
Idiot.

why dont you research ways in which you might start magically shitting gold.
i mean sure, you can never know something is impossible 100% but you can get pretty close, what i say makes about much sense as yours

Because it DOESN'T affect all matter equally. Only the electron clouds around atoms and only when those electrons are in certain configurations. Only a few substances exhibit diamagnetism. Water is weakly diamagnetic -- which is why you can float a frog in a heck of a field. Bismuth is better and is usually used in experiments to demonstrate the phenomena to students. Both are very weak compared to ferromagnetism.

I worded my statement carefully in an attempt to rule out the other 3 known forces.