Your credit score is the result of your credit behaviour. You can increase the score easily by regulating your credit activities. Never miss a payment on your loans and credit cards. Any default will remain on your credit report and curtain the chances of future loan approval and damage your credit score as well.
When it comes to credit cards, use it only when required. Exceeding 50% of the credit utilisation ratio will give a hint to the lenders that you are hungry for credit and this could also have an impact on your credit score.
Lastly, have a mix of different credits and maintain them responsibly to increase your score. However, applying for multiple credits at the same time could affect your credit score.