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I've heard, leaving my sending wallet open will usually keep broadcasting and also I heard that one might try adjusting the fee... is that correct?
- bitcoin core (bitcoin-qt) will indeed keep rebroadcasting your transaction, most other wallets won't
- adjusting the fee is basically using RBF, it will only work if you opted in RBF when creating your transaction
You can use the fee checker on my website to find out if your tx has a decent chance of getting in the next 24 blocks, and you'll be given all possible options to speed up the confirmation that i know off:
http://www.mocacinno.com/page/feechecker