Visitor Visa - B2

Went for my interview this morning at 10am

Me: good morning

VO: morning

Me: How are you?

VO: I'm very well

VO: why do you want to go to the US

Me: I'm going there to attend the 2017 family caregiver conference and for tourism

VO: Do you have any property?

Me: No

VO: How long have you been in this country

Me: 8 years

VO: Do you have children?

Me: Yes

VO: Where do you work, any letter from your employer?

Me: I'm a family career

VO: Whats your duty?

Me: I give ongoing care to my some of my children due to disabilities

VO: Ok ok, are you married?

Me: Yes

VO: Is your wife Irish

Me: no we're from the same nationality

VO: Oh thats good

VO: Can i see your bank statement?

Me: yes, gave it to him.

VO: your income from where?

Me: from the state here.

VO: i'm concerned about your financial ability, sorry i'm unable to issue you a NIV now, you can reapply next time.

Me: No problem thank you very much with a smile

VO: You're very welcome with a smile

My observation:

(1) He flip over my bank statement's first page where my current balance shows 3,000Euro

(2) No other visa in my passport than my residency, but i think i made a mistake for not telling him i've been to the UK twice.

(3) I have a return ticket to my home country which i took to the interview but i forgot to show him that i will be travelling from Ireland to my home country after my US visit as i've purchased my ticket already.

I've been refused once 13 years ago when i was single in my country of nationality, today is my second refusal. I genuinely can't abandon my family and sit right there in US.

Where do i got it wrong? How soon can i reapply? Does it make sense to apply immediately or give it time when after i visited another country, i currently hold Turkish evisa.