What's another way to say "to become"?

Question

As in this simple example:

I want to become a firefighter.

Now, you could replace "become" with "be", but that technically changes the meaning.

I found synonyms on collinsdictionary listed below, but they don't seem to work in my example.

"come to be, develop into, be transformed into, grow into, change into, evolve into, alter to, mature into, metamorphose into, ripen into"

Answer 1

Also specific to example:

"be employed as" "get a job as" "pursue a career as" "get work as" "work as" "be hired as" "enter the [...] field" "enter the [...] profession"

Answer 2

Well specific to the example, perhaps you could take either of these routes.

I aspire to be a firefighter.

I am an aspiring firefighter.

Those do anything for you?