I accidentally sent all my bitcoin with 0 fee. I waited 6 weeks already and neither the receiving address nor my node shows the bitcoins.

I checked on the blockchain mempool and my transaction code cannot be found - most likely "forgotten"

I also checked the blockchain for my wallet's address balance and the online platform shows that that the missing bitcoins are there / should be in my core nodes wallet

So I am stuck - Without the transaction code I cant pay services to help process it. My node wont let me resend it because it shows 0 bitcoins.
My node version is very old - 0.8.3 beta so I cant do any RBF, PPFC etc. and I have been trying to transfer it to electum by dumpkey but it says key cannot be found error code -4

What can I do here?