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Breakthrough starshot.
It needs a relatively small amount of funding. Essentially a 100 gigawatt powerplant, strapped to a 1kmx1km array of lasers. Very lightweight probes (that could potentially be mass manufactured) propelled by these lasers.
If it comes to fruition, we could have probes that we can send to nearly our entire stellar neighborhood at significant fractions of the speed of light.
We could:
Literally SciFi stuff that we can achieve with little bit of development in material science. Again, the bottleneck is FUNDING, not technological. But come on, it's so worth it!
I've always been confused why Breakthrough Starshot always showed the square km laser array on the ground instead of a bunch of satellites in orbit. That way you wouldn't have to account for atmospheric attenuation of the lasers PLUS you could probably get military funding for putting a gigawatt of laser capacity in orbit lmao.
Like sure, the likes of Starlink were still just getting going when Breakthrough Starshot was conceptualised, so the idea of a large satellite constellation probably wasn't on their radar yet, but at the same time - they were talking about sending thousands of probes to Proxima Centauri so it's a mystery to me why they didn't see that kind of technological progress being possible by the time we were doing that
...and without causing political problems!