13 word seed phrase found from my old BTC wallet from 2018. What do I do?

I've found a 13 phrase recovery seed alongisde my password for an old BTC wallet I had but I have no idea how to recover it. I tried going on BTC wallet but there is no option of recovering a wallet and I can't get anything to work on any other provider (exodus, electrum)
What do I do? Why is everything either 12 or 24 words too? :(