Can you suggest unique tips to increase credit score from 700 to 800?

You have a good credit score, buddy! But let me tell you, there is no fast process to increase your credit score. I would suggest you to charge your credit card(s) for small amounts. This way you can keep your credit utilization ratio (accounts for 30% of your credit score) low. And make sure to pay off your outstanding balance amount in full and always on time! Hopefully, you will see a improvement in your credit score after a certain time.

Use a secured credit card. That's the safest way to boost your credit score. Since you have already to deposit an amount as security against the credit card, so the chances of defaulting on payments are less. On-time payments can help to increase your credit score by a great extent.

Make on-time payments, and before due date. use credit cards wisely. Do not incur more debt, so avoid payday loans.