Slacker's opposite, in modern lingo

• Exert oneself
• Pull out all the stops
• Strive for success
• Give it one's all
• Make every effort
• Make a real effort
• Give it your best shot

Wiktionary Word definitions in Wiktionary
alt. (context derogatory English) A person usually of little talent who tries hard to succeed, especially through imitation, usually to gain fame or popularity. n. (context derogatory English) A person usually of little talent who tries hard to succeed, ...