It’s better to hold onto something you have than risk losing it by trying to get something better.
"I decided to keep the job offer I already have because a bird in the hand is worth two in the bush."
to stop a problem before it gets worse
a person or thing that becomes successful very quickly
a clever and intelligent person
to act in a manipulative or strategic way to gain advantage
To be extremely anxious or tense.
to move gently onto something