Move all your funds to a wallet where you control the private key, in the case of a chain split you will be able to choose which chain you want your coins in.
examples of a wallet where you control the private key: Paper wallet, Trezor, Nano S
You can generate your own paper wallet at : https://bitcoinpaperwallet.com. before doing so watch a few tutorials on youtube,make sure you do it right and your funds are safe. Good luck.