I dont to have a new wallet with a new seed phrase and then transfer them.
These seeds are located in the wallet file and are encrypted with the password. If someone can access the private keys, seeds, wallet file (+ password to decrypt it,) then he will be able to send those coins.
If you think your old computer is not safe, search for the wallet file[1], move it to the new wallet and decrypt it using the password (do not share it)
If you wallet file use an easy password it is better to edit it or delete it.
[1] https://electrum.readthedocs.io/en/latest/faq.html#where-is-the-electrum-datadir-located