Telegram's audience is accustomed to useful and interesting content, and their expectations must be met by constantly providing subscribers with something that will inspire them to read you further and not turn off notifications.
Such content can be generated by opinion leaders, companies and experts.
For example, we, Completo, share our expertise with usa consumer email list subscribers through articles, cases, events, and video materials on all relevant marketing and other issues.
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Important: you shouldn't tie every post to a product. You can touch on topics from your field, answering questions from your audience with material, thus demonstrating your care for them. Useful content is not always educational or expert, there is a place for entertainment in Telegram: don't make all the materials "boring", dilute them with appropriate humor so that users don't get bored.