Stuck on 0.7655

Hey Everyone, I am quite new to data science and machine learning. I started with a rough estimate of the best features and got a 0.7655 using a RandomForestClassifier. I tried a lot of other things including a bit of feature engineering but nothing so far has helped me push my score up! So quite a few submissions later I decided on using Boosting, which gave me a result of 0.6267. As you can see that is not how I intended it to go! So any experienced Kagglers feel like helping the new kid on the block? Please!

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