Do you have a 12-/18-/24- word seed backup? Or can you export the private keys of your addresses?
If so, you can import them into another wallet (e.g. electrum:
https://electrum.org/#home).
You will be able to adjust the fee as you wish, but low fees lead to low (to no) confirmation time.
Currently there are 280k+ unconfirmed transactions waiting to get confirmed.
The only way to send your coins cheaply is to send a low-fee-TX and wait for it to get confirmed.
To get an estimated time interval until your fee will probably get confirmed, you can visit:
https://bitcoinfees.earn.com/