Since Cryptopia will delisting MER, so where I can transfer the MER? WavesWallet? Tidex? what the best solution right now?
Waves DEX for sure.
That way the coins are in your possession, not on an exchange.
Don't forget to backup the seed of your Waves address,
manual to do so is on top of the second post of the Waves topic.
Seems they disable the withdrawal, I cannot withdraw my MER to Waves DEX, what should I do?
Open a ticket with the exchange.