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No matter which distro you actually use, the ArchWiki has a detailed section on overclocking AMD GPUs, including manual OC as well as a list of several CLI and GUI tools.
That said, I'll second the recommendation of corectl if you're looking for something user-friendly.
Can you check if you're using the amdgpu driver stack?
dmesg | grep amdgpu
To OP, I'll add that it's very important to force the amdgpu kernel driver on your GCN 1.0 GPU, as it's the only way to get Vulkan support (required by pretty much all of the GPU compatibility layers that Proton/Steam uses).
You could try corectrl, don't know if it works with that GPU but it supports desktop AMD GPUs
It didn't :(
Have you enabled the necessary kernel boot flags first?