I forgot to confirm the address on my Ledger and sent my BTC to said address. Is that BTC now lost to the ether? Already increased transaction fee.

Hi! I made 2 transactions through Bitcoin Core and mistakenly chose a very very low fee. That?s why my transactions are never-confirmed for months. When I tried to accelerate through third parties, they say my transaction ID does not exist. What can I do? It showed up on my receiving wallet but says pending.
TX hash says Transaction invalid: some outputs that it attempts to spend have been already spent or are no longer valid.