@yatri456
Welcome!
Presumably you have already deleted browser history?
You may need to backup essential data and reset device to "Out of box" state by keying in *#7370# followed by 12345 (default Nokia lock code unless altered by yourself) to free up the most phone memory.
If I've helped in any way, a click upon the white star at bottom right of screen would always be appreciated.
However if my answer also solves your problem clicking
below it will benefit other users!