Keep a backup option warm and quiet. Desperation starts the moment you only have one door.

Having a single option changes how you behave before you have noticed it happening. You accept worse terms, you laugh at things you do not find funny, you stay longer than you meant to, because the alternative is nothing. A second option does not have to be as good. Its whole job is to make the first one a choice rather than a necessity.

Spend an hour this week on a second door: an application, a conversation, a contact you keep warm. You are not planning to leave. You are buying the ability to say no, which changes how the current thing treats you.