There seems to be a mad rush of developing and developed
nations sending or having sent spacecraft to orbit the Moon.

That's fine as it goes; India, China, Great Britain, etc,
do need to practice deep-space missions before going
on to farther and more ambitious targets.
Mars, Venus, the asteroids, the comets do beckon
beyond this Moon rush.

But so far I see little collaboration and or syncronization
of efforts....It's like each nation or agency is spending
money unnecessarily now to "reinvent the wheel", instead
of striking out in a new direction or using a fresh approach.

It would be great to see a future Chang-E orbiter that would
drop a copper ball into a dark polar crater at 1700 meters per second
to see if a fast erupting cloud of ice crystals would result.
And a future Chandrayan lunar orbiter leaving seismometers
on the surface beforehand to detect the seismic signals from the Chinese
impactor.

It would be great to see an American or German lunar orbiter
equipped with an inflatable radar telescope to
detect radio emissions on the farside of the moon,
that are normally subject to terrestrial interference/contamination,
while a future KAYUGA orbiter could relay transmissions from that
orbiting radio observatory back to Earth.

etc.....

As for the asteroids?.... Why dublicate efforts?
You could have India send a flyby or orbiter mission to the
Asteroid Juno, while China could target Pallas.
And Russia or Great Britain [or Belgium] could target some NEO's
like Toutalis, Icarus, etc.
My favorite target would be the dumbbelll shaped metal asteroid,
Kleopatra. NASA could target that one.

And each nation could try different approaches to sample
return missions from asteroids and comets.
My favorite method would be to crash a metal object
into an asteroid, using the DEEP IMPACT method,
and returning captured dust samples, like the STARDUST
did.
Any other suggestions I can list?