It's been more than 21 days and since I've self-prepared my taxes and I have not received anything from my bank,... Any resolutions to fix this?

It's a bit confusing when you said both of these statements: "haven't received anything from my bank" and "I already had return sent to brokerage account."  So I'll provide some general information below.  Then, if necessary, you can clarify your situation.  Note:  The answer can also be further complicated if you chose to pay any TurboTax fees out of your Federal refund.

So start this way:

If you efiled, double-check to be sure the return was efiled successfully and accepted.
If you used Online TurboTax, you can sign into your Online Account and check the efile status at the Tax Home.  If you used desktop software, you can check from within the software.

If that showed it was accepted, (or if you mailed a paper return), you can use the "Where's My Refund" tool at the IRS website below to monitor the status of your Federal refund. 

https://www.irs.gov/wheres-my-refund
See what is displayed there about your refund. 

Here are some tips when using the IRS "Where's My Refund" tool:

• If you efiled, be sure you have waited at least 24 hours after acceptance before using the IRS WMR tool.   If you mailed a paper return, it won't show up in the tool for at least 4 weeks or longer.
• Be sure you enter the correct tax year, SSN and filing status.
• Be sure you are using only the Federal refund amount.   Do not include any state refund or any total refund or net refund (Fed and State) that TurboTax may have provided on a screen.  
• Look at your actual Federal return to get the Federal refund amount, i.e., your Form 1040, Line 35a.

FAQ:  How do I track my state refund?

https://ttlc.intuit.com/community/refund-status/help/how-do-i-track-my-state-refund/00/25571