step up vs come forward

step up and come forward both are verbs.

Word	Noun	Adjective	Verb	Adverb
step up	No	No	Yes	No
come forward	No	No	Yes	No

As verbs, step up and come forward are synonyms defined as:

Other synonyms of step up include come out, come to the fore, step forward, step to the fore.

step up (verb)	come forward (verb)
increase in extent or intensity	make oneself visible; take action
speed up
make oneself visible; take action