My eye number is left -2.50 and right -4.50. Please suggest me some remedies to reduce the eye power

Have you talked to your doctor about RK or something like that to get a permanent correction?

You can wear corrective lenses, get surgery or do eye therapy. Going to see your Optometrist is the first step. They will tell you what to do from there.

Eat carrots

The only techniques that are more than hype like eye exercises are orthokeratology gas permeable contact lenses and lasik surgery.