Can I post Islamic reminders if I still sin a lot?

Reminding others is a good deed

The Quran tells us to keep reminding, because reminders help people:

The Prophet ﷺ said, "Convey from me, even if it is one verse" (Sahih al-Bukhari 3461). He didn't say "once you stop sinning". Sharing a verse, a short hadith or a kind reminder is part of this. Many scholars point out that commanding good and avoiding sin are two separate duties: failing at one doesn't cancel the other.

The warning to keep in mind

Allah also says:

This verse is about people who boast or make promises they don't intend to keep. It isn't telling a struggling believer to go quiet. It's telling all of us to try to live what we say. So when you post about praying on time, let it nudge you to pray on time too.

Don't advertise your own sins

There's a difference between "I'm not perfect" and posting details of what you did wrong. The Prophet ﷺ said all of his community would be forgiven except those who expose themselves, describing a sin Allah had kept hidden (Sahih al-Bukhari 6069). Repent privately, and keep sharing what's good. If you keep falling into the same sin, don't give up. See Will Allah forgive me if I keep committing the same sin?

Check your heart, not your follower count

• Intention: post to help, not to look pious. See Is it showing off to post my worship on social media?
• Accuracy: quote verses and hadith correctly, with the source. See Can I quote Quran verses on social media?
• Tone: speak to "us", not down to "you". It's more honest and people listen more.