There’s definitely the genetic component too, but the scents from soap is an interesting thing to test out.

And for what it’s worth some types of oil of lemon eucalyptus works reasonably well, if you don’t want to use DEET. https://www.consumerreports.org/health/insect-repellent/oil-of-lemon-eucalyptus-insect-repellents-a7989538414/

Some friends really like this stuff “Repel Lemon Eucalyptus Insect Repellent2 Pump” and consumer reports also thinks it works pretty well.

There’s some reports that the interaction of soaps and shampoos influence how tasty a person smells, so it might be worth trying different products.

https://www.prevention.com/health/a43863971/different-soaps-may-make-you-more-attractive-to-mosquitoes/

Write MP3s to them and use them to play one song in a modern car.

(I saw a video of someone playing a clip of music using a USB floppy drive)

I run my own XMPP server. https://joinjabber.org/ has some introductory information Snickket is a all in one service you can host or your can pay them to host https://snikket.org/start/

XMPP servers and clients are a lot lighter weight than matrix, though I think matrix has more fancy features.

They’re both self hostable and are federated to share the costs of running the network.

With signal there’s a non-profit that needs some pretty steam funding to stay in business. (Though they’re popular so maybe they can get it) https://www.pcmag.com/news/want-to-run-an-encrypted-chat-app-youll-need-50-million-signal-says