Ok, I have read about the Lithium Luna release that's supposed to be ASIC resistant. However, I'm unclear about whether Monero is now using a new hash algorithm. Is Monero still using its CryptoNight algorithm or some variant?
Broadly speaking, it is still using the Cryptonight design, but the v7 hardfork included some modifications to the algorithm to brick the current generation of ASICs.
All v6 mining software, including pools, have had to upgrade to match the new algorithm.