It will be near impossible to get your rating up quickly later when you're around 1800+, unless you're a prodigy, but at your level, the best thing to do is do tactics, play a good amount of games, and perhaps study a few beginner books.
I am approaching 1800 OTB now, and I really need a way to get my rating up-5 hours of tactics the week before the tournament is not helping. So tactics trainer does not work that much for me. Any effective way? I have been this level for a darn good time.
There is no foolproof way to guarantee a quick rating rise - for it depends on competitive results. All we can do is help you improve your game, and hopefully the competitive results will follow.
There are a few ways to improve your game at that level. Some have already been stated, such as lengthening your time control and playing more often.
Those should work fine, but I also recommend solving puzzles on the Tactics Trainer or from a book. Even just a few a day will help sharpen your tactical vision and, consequently, lead to you seeing more on the same chessboard.
And one more thing: Analyze your long games after you're done with them and see if you can find recurring mistakes. If you can, eliminate them!