Is there a proverb in English to convey the meaning "Attempting to catch a flying bird by accidentally releasing the one in hand."? [duplicate]

Question

Attempting to catch a flying bird by accidentally releasing the one in hand.

For example, pursuing other attractive objects for getting more benefit but accidentally losing the benefits from the existing owned objects.

Is there such a proverb in English with the above meaning?

Answer 1

A bird in hand is worth two in the bush.

Used to say that it is better to hold onto something one has than to risk losing it by trying to get something better. [Merriam Webster]

Grasp all, lose all also conveys the idea.

One who wants everything may lose it all. [Wikitionary]