If you have not done KYC you probably hit the limit.
No KYC means no access to any of Coinbase's features as said above. Given the fact that OP has conducted transactions (see screenshot) he has walked himself through their KYC procedure already.
IF you have done KYC then you might have hit received BTC from some place they did not like or sent it to some place that they did not like.
That's the most likely reason. However, OP will not find out what caused Coinbase to restrict his account. Coinbase most likely does that to not give their users an edge over their security system, which is lame because you want to be as transparent as possible towards your users so they don't make the same mistake twice, which could result in account termination.