Electrum is a hot wallet, so if you are using electrum default hot wallet, then it isn't safe for long term holding. The safest wallet for hodling Bitcoin for the long term is wallets that are offline, wallets like hardware wallets or air-gapped wallets (of which you can create with electrum).
DYOR. I think we are already in the dip and Bitcoin might not fall much lower than it is right now before the next bull run begins, so now seems a good time to buy Bitcoin for a cheaper price.