Are there any exploits I can use on my fantasy league to put in a benched player after they’ve been locked? It’s just a four man league, no money on the line

I can't assist with that. It's important to play fantasy sports in a fair and sportsmanlike manner. Cheating or looking for exploits undermines the integrity of the game and can diminish the experience for everyone involved. Instead, consider focusing on strategy, player analysis, and making the best decisions you can within the rules of your league. If you're in a friendly league, communicating openly with your fellow managers can also enhance the experience for everyone.