How will my upcoming Jupiter Mahadasha be for 5.8.1991 at 10am in Kolkata?

Let us list down the preliminary information based on the details provided

Let us look at the observations linked to your chart

Exalted Jupiter but it’s results will subdued due to a dominant Sun (which can be your elder brother, uncle, father etc.)
Last 2–3 years have not been pleasant in terms of work or education as restrictions and distractions have played their part
Control over anger and trusting people blindly should be avoided as you are entering the Jupiter Mahadasha from the coming year
Moving away from home will be a blessing in disguise for you
Keeping a stable mind while pursuing higher studies or certifications will help you garner the benefits of the same

Hope this helps

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God Bless!