Is there any other way or option to renew my Indian passport which is?
Unfortunately there is no way other than PSK or designated post offices. But don't worry, you can get passport reissued even after expiry. If any urgent international travel (which is highly unlikely due to travel restrictions across the world) you may try tatkal whenever appointments open up. However my advise would be to take it easy and wait for situation to improve before you go after the renewal process.