Edit: I realized kano wants you to delete the wallet altogether; it's a bit safer since you won't need to worry about your device being compromised physically, but also means you will need to restore your wallet to spend from it. If you decide to do this instead, simply format whichever device you chose to use after setting up a watching-only wallet from the link I shared above.
To simplify the process, you could use Tails. A benefit is that if you want to also wipe the wallet in the process, you can use their secure wipe which overwrites the partition so that it is irrecoverable. There's a guide within the Electrum's docs to document the process[1].
[1]
https://github.com/spesmilo/electrum-docs/blob/master/tails.rst
My take is that, if you have some funds but don't want to splurge on a Hardware wallet yet. You could try getting a Raspberry Pi and setting it up as an airgapped wallet. While it can't offer comparable security to most hardware wallets, it does offer sufficient security for the price and the effort you take to set it up.
I've used mine on a Raspbian Image and it has been working pretty well so far.