Asking a tenant to evict an apartment because it is sold

Hello,

I had taken an apartment for rent expecting to live there for 4-5 years. Considering it, I had spent a lot of money on moving in arrangements for the apartment.

After 3 months of moving in, the owner said he sold the property to someone else. Then the new landlord comes and shared all details of the takeover, and sent me a legal notice to evict the property exactly one year later because the new landlord is coming to stay there.

What can be done to protect the situation? As I know this is quite within the legal grounds, so cannot complain, right?

But in the future, how can I protect my situation? Maybe by a multiple-year contract? Is it valid? What can I do to protect my existing situation, etc?

Could you please help?