Where to save money when saving for a house.

M27 - Currently saving for a home. I am about to reach the 250k threshold my bank has for 5% Interest p.a

Would it be worth A) opening up another account and repeating the process B)Buying ETFS C) something else?

I’m looking to buy in 1-2 years. But in the meantime considering other options. I don’t have a diverse portfolio whatsoever.