self-motivated
US /ˌselfˈmoʊtɪveɪtɪd/
UK /ˌselfˈmoʊtɪveɪtɪd/

1.
able to motivate oneself; ambitious and driven
:
•
She is a highly self-motivated individual who always strives for excellence.
•
We are looking for self-motivated candidates for this challenging role.