Is the phone being recognised when connected into a notebook/PC? If so recovery software might work.
Otherwise bring it to a reputable repair shop. If the system board isn't completely borked they could connect it to a rig to access the data. Otherwise they'd have to desolder the mem chips to put in a working board, all depends what value the data you want is worth.
Definitely no backups in the cloud? WhatsApp etc etc
Edit: presume the phone is completely dried out, tried a recovery mode boot etc?