An audience can provide feedback and opportunity. It also creates expectations. Give the underlying skill enough practice that your public promise has a real basis.
Choose a small task you can perform responsibly and explain your present scope honestly. A beginner can contribute useful work without claiming mastery. Use supervision or appropriate expertise where the consequences require it.
Produce a complete example
In a fictional spreadsheet project, create a workbook that opens, calculates correctly and includes understandable instructions. Ask a suitable person to test it with a realistic example. Their difficulties reveal work that a promotional post cannot resolve.
Keep a record of corrections and repeat the task. Notice which results you can now produce dependably and which still require assistance.
Public explanation becomes stronger when it grows from that practice. You can show the method, its limits and the evidence behind its claims. Let the audience develop alongside a skill you are genuinely improving. Attention is more useful when there is something substantial for an interested person to receive after clicking through.