I'm keen to get back into the art of memory and start training for the 2019 Australian competition next November.
Last night I pulled out my cards PAO system. I'm pretty happy with it and still remember probably over half of it pretty easily, and I don't think it will take me long to solidify the rest.
I previously (3 years ago) used a PAO system for numbers as well, but I was never very happy with it. I'm exploring the major system as potentially a better method.