Striving is an active process of trying hard to achieve something, and there are several synonyms to describe this action. One common synonym for "striven for" is "worked towards." This phrase implies putting in time, effort, and dedication towards a goal. Another synonym could be "pursued with determination," which highlights a strong desire to reach a certain objective. The phrase "strived to attain" is also a reliable synonym, suggesting that an individual is putting in the necessary work to reach a specific outcome. Other synonyms could be "aimed for," "pushed for," "sought after," or "aspired to achieve." Overall, there are various words that could be used to describe the idea of striving towards a goal.