The need for investments will have to be balanced with your age and risk profile based upon your sustainability of your earnings on regular basis. As your income is in the nature of retainer basis, your income will be considered as professional income. You will be entitled to claim all the reasonable expenses incurred for the purpose of earning your professional income. Few examples of such expenses are - travel, conveyance, vehicle maintenance, power, communication expenses, rent, books & periodicals and depreciation on assets such as computers & vehicle.
Your investments for the purpose of claiming deductions u/s 80C upto Rs. 1.50 Lakhs can be towards Life insurance policies, PPF, NSCs, repayment of housing loan etc. You need to balance these investments/expenses based upon your financial commitments of short term and long term in nature and see how best they add to your wealth and not just for tax saving purposes.
In addition to deductions u/s 80C, you can also invest in NPS for an additional sum upto Rs. 1.5 lakhs subject to the compliance with the conditions specified therein.
The deductions towards medical insurance and medical expenses can be claimed.
While the above are few suggestions general in nature, proper and relevant advice for investment will depend upon the facts of your case.