considering the difficulty is there really any reason to be mining this with CPU at all now? It looks to me like you should be mining this with GPUs now.
Yes we are at the GPU point from the looks of things.. to go a guide on GPU it just very long bc so many different things.. different miners.. for different GPUs.. on different platforms..
here is a good guide.. its for Monero but it works for Royalties as well
https://www.cryptocompare.com/mining/guides/how-to-mine-monero/