Add the required network (Polygon Mainnet) in your metamask using this link
Buying Matic with Moonpay
Step 1. Find an exchange
To buy Polygon you need to find a cryptocurrency exchange. The easiest way is via Moonpay which allows you to purchase MATIC simply with a debit card
Step 2. Enter the amount in MATIC or fiat currency that you wish to purchase
Step 3. Enter your MATIC wallet address
Step 4. Verify your email and basic information
Step 5. Enter your preferred payment details and confirm your purchase
How do I buy an NFT?
Please ensure you have Matic in your wallet and you are on the Polygon Mainnet Network (Not on Ethereum Mainnet), either through an exchange or on Polygon Faucet here (This can be used to cover the gas fees)
Clear your cookie cache, and then reinstall MetaMask.
Why is the transaction taking longer than expected?
You can speed up the transaction by ****adding more MATIC gas fees. This usually allows the transaction to be executed faster. Here is an additional step to speed up the transaction with 40Gwei:https://polygonscan.com/gastracker