British Pension US citizen

I am a British expat. I have a UK pension that is deposited into my old UK bank account.

I transfer money as needed. How do I deal with this on the return? I have a UK state pension and a private pension that I inherited from my late husband, I also get Social Security here, this was reduced when it started 2:1 on the English money. Also I have heard about FACTA, currently my British account is north of $15K. Is there anything I should be doing?