What is the opposite of a metaphorical barrier?

Question

I am trying to find a noun that describes a person that enables others to be more productive. The opposite of that is a roadblock or barrier.
My first thought was a sail, since the addition of another sail in the correct place allows a ship to reach its destination faster. But this strikes as too obscure.
Is there a shared metaphor/simile that would capture this idea and satisfies these conditions

noun that can be applied to a person (Bill is a ... )
not obscure
helps others achieve their goals better (rather than his own goals)

Jason Bassford · Accepted Answer

More literal
As opposed to a hindrance:

Bill is a facilitator:

[Merriam-Webster]
: someone or something that facilitates something
especially : someone who helps to bring about an outcome (such as learning, productivity, or communication) by providing indirect or unobtrusive assistance, guidance, or supervision
// the workshop's facilitator kept discussion flowing smoothly

More metaphorical
As opposed to a roadblock:

Bill is a passageway:

[Merriam-Webster]
: a way that allows passage

Depending on the required nuance, gateway could also be used.

user450 · Answer

Off the top of my head,I can think of these three:
"leg up", "driving force", and "actuator"

What is the opposite of a metaphorical barrier?

2 Answers

More literal

More metaphorical

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