Of course use Signal or Matrix but please don't think that makes your messaging entirely impenetrable. I am not saying their end-to-end encryption has been breached. But a compromised device is a compromised device. Signal might be secure at least for now, but is your keyboard?
We do live in times of zero-click spyware and while the general public doesn't necessarily have to worry about things like Pegasus atm, it is still used increasingly and not just against people who break the law.
I do my best, although I do fail to be up to date every once in a while, to stay as secure as possible, but to think any communication is entirely secure is not a good policy.