With time, as you continue to use your Coinbase account to buy and sell digital currency, the amounts which you are able to purchase should generally increase.
Coinbase account limits are determined by an algorithm which takes a variety of factors into account, including but not limited to, account age, location, transaction history, payment method, and verification steps completed.
Unfortunately this means that limits can sometimes go down for customers. If this happens, the best way to increase your limits again is to visit your Verifications page and complete any verification steps under the section titled "Raise your limits". If you have not done so already, in most cases this will require that you upload a copy of your ID, take our ID quiz, or even just wait a few days.
If you have already completed all of the verification steps listed under the "Raise your limits" section and still need to increase your buying or selling limits, you may also be able to complete our additional verification steps.