Water damaged nothing working

Hi

I was recently at a pool party and stupidly forgot my iPhone was in my pocket

What makes it worse is that I couldn't turn the phone off because the on/off button is faulty

I have taken the phone apart when home, one of the wet indicators is red I took the battery out and cleaned the logic board in isopropyl alcohol.

Put the phone back together and still is black nothing is running.

I have brought a new battery which will be delivered soon if the battery change doesn't work what else can I do?

I haven't backed up for a while and have over 6000 pictures and 200 videos from holidays etc which will be devastating to lose.

Could a data retrieval company help?