What are all the actions that can be performed with a seed phrase

[Bitcoin]

What are all the actions that can be performed with a seed phrase

I am asking this question because  someone (malicious) else has access to a seed phrase I created and transacted for the first time. So the wallet is active in the blockchain.

Currently the seed phrase doesn't store any founds on my end.
But I imagine can it still be used. Is it useful in anyway ?
Can somebody explain if there are risks associated to
This situation?

I'm not using that wallet I created a new one to store my coins.

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