That is tough, as Telegram basically fills the niche of an online open bulletin-board. Its very nature is to communicate without major barriers of identification, verification, or robust security of confidentiality/integrity. If you are looking to communicate confidentiality, then you need to switch to something different.
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Any recommendations from a cyber security expert like yourself?
I like:
Proton Mail for a privacy email
DuckDuckGo for a privacy search engine
Signal for an instant messenger
Take a look here for a good list of many privacy tools: https://www.deepwebsiteslinks.com/best-privacy-tools/