There is pivotal

– adjective 2

– of vital or critical importance A pivotal event.

www.dictionary.org/. There

is also ‘central’ central

– adjective 3

– constituting something from which other related things proceed or upon which they depend. a central office.

4 – principal; chief; dominant: a piece of the play’s central character.

You can visit www.dictionary.com. What

is com?

The adjective critical has several meanings, among them, ” vital,” “verging on emergency,” “tending to point out errors,” and “careful.” If

you’re an emergency-room doctor with a patient in critical condition (on the highest alert), it’s absolutely critical (vital or essential) that you be critical (careful and judicious) in your approach to their care, so that at the critical (decisive) moment, you can save their life.

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Consider instrumental :

involved in an important way in making something happen

Example: an instrumental figure in the governor’s campaign for re-election

( Macmillan Dictionary )

What would be the key to unlock?

She became a key figure in the suffragette movement OED. ; a key figure in

the parliamentary movement in c and s. /.d of crucial importance : she became a key figure in the suffragette movement, OED. (OED).

You could use integral

of or belonging as an essential part of the whole; necessary to completeness; constituent: an integral part.

What other factors are involved in the economic recovery of Russia?