Maybe this one could help. Try to use 50-60 gwei
It got a guide on how to overwrite a transaction
https://www.reddit.com/r/EtherDelta/comments/72tctz/guide_how_to_cancel_a_pending_transaction/

Edited:
Overwrite transaction with higher gas price
1. Go to Etherscan and find your earliest pending transaction. Note the nonce and your from address.
2. Go to https://myetherwallet.com, and select the offline transaction tab.
3. Enter your from address.
4. Send 0 ETH to any address of your choosing.
5. For gas limit, use 150000.
6. For gas price, use a higher gas price than what you used before. 30 gwei should be good.
Note: 50 gwei is 50000000000 wei (that's 9 more zeros after the 30).
Check ethgasstation.info for current gas estimates, as 30 might be too low/high at a certain moment.
7. Enter the nonce you got from Etherscan.
8. Import your private key.
9. Sign the transaction.
10. Send the transaction. It should overwrite your previous one.
11. Repeat as necessary to overwrite other pending transactions with low gas prices.

Couple of questions:

1. What is the incentive of investing in pre-sale vs ICO? Is it just 10% more token?
2. In the whitepaper, the categories of tokens have different sets of cities, whereas in your FAQ, it says that red will be valid everywhere, orange will be less widely accepted and yellow is least widely accepted. Which statement is true?
3. Why create three categories of token instead of just one, and use different quantities?