To produce precious metals via fission, you need a starting metal with about twice the atomic weight of the desired end product. In practical terms this means the starting metal is more precious than the end product.
Furthermore, the fission process releases neutrons and gamma rays in deadly quantities, and the fission products are themselves often violently radioactive for periods of time ranging from hours to centuries.
The fission process is also "unclean" from the standpoint that you do not get two clean halves of the raw material as the product; you get a variety of fission products from which you then must sort out the one you wanted in the first place. Remember that since most of the fission products are to one degree or another radioactive, this implies wet chemical extraction processing in a highly radioactive environment.
Fusion processes are even more difficult to master for the purposes of making your own precious metals, for a variety of reasons that I will summarize below.
If we take two heavy elements and endeavor to press them together hard enough to fuse them into one heavier element, we discover that the amount of pressure required to get the nuclei close enough together to fuse is truly gigantic because of how hard they electrostatically repel one another. we have been trying for almost 70 years to invent some way of doing this and we are not there yet. This process is so hard to trigger that the only way it happens in bulk is in the collapsing core of a supermassive star during a supernova.
If we instead take one heavy element and try to add neutrons or protons to it one or two at a time, we find that the most likely outcome is that as soon as we add them, the resulting nucleus is highly unstable and quickly decays or fissions or spits out a small lump of neutrons and protons and the net yield of heavier nuclei is tiny.
In this case, the only environment in which this process produces heavier nuclei in bulk quantities occurs in the extended envelope of a red giant star and takes hundreds of thousands of years. Small quantities of heavy elements (specifically, isotopes of plutonium) can be made this way by starting with uranium and subjecting it to extremely intense neutron bombardment- which is how we make plutonium for use in fission bombs. This process is extraordinarily expensive, hazardous, and produces huge quantities of highly radioactive waste which require foolproof deep storage for tens of thousands of years.