Can I switch the way I choose to get my refund after I’ve already filed ?

No. You won't be able to make any changes until your return has been accepted or rejected by the IRS. If rejected, you would need to correct any information that caused your return to be rejected as well as make any other changes to your return that you see fit, then proceed to resubmit your return.

So if it’s been accepted already ,can I change the way I receive my refund if I don’t want to go to my bank anymore? 

No, once you have filed your return and it has been accepted by the IRS, you can no longer make changes to the direct deposit information you provided.  If your financial institution rejects the deposit, the government will make you a refund check.