The striker was a scoring substitute during Saturday's 3-3 draw against West Brom at Upton Park.
Maiga said: "I think overall there's not much wrong, perhaps a slight lacking in confidence.
"The only solution is to work hard. Hard work and then, ultimately, we'll see how it goes.
"We'll carry on working hard and I believe it's just the small things that are missing right now - but we'll be OK."
The Hammers have collected just two points from their last six league games and Maiga added of the West Brom draw: "It was a tough game physically.
"Though we're disappointed, the most important thing now is to pick ourselves up for the next game, so that things turn in our favour.
"Every point is important and the most important thing on Saturday was not to lose. We've got to try to continue to play as we did in the second half."
With Andy Carroll still recovering from his heel injury, Sam Allardyce has played with no more than one striker so far this season and Maiga is still adjusting to a change in approach.
"I'm really happy," he added.
"Though I'm not that used to playing in this system, I've dealt with it and I'm pleased to have scored. It's reward for me and for my work and I hope it's going to continue."