Hi Usha,
You could do that, but please remember you’re only installing the same files again and it if happens to be host environment issue then it will still the same.
And unfortunately, we don’t offer any installation in the forum. I recommend contacting the hosting provider and have it installed for you and configure the memory and disable any existing internal caching. Please note each hosting has its own standard way of installing Wordpress, could be managed one or installed through script installer. Please check this too https://documentation.cpanel.net/display/CKB/WordPress+Manager
I checked ushamaharaj.com and it’s indeed problematic, there are times it will load and there aren’t regardless of memory limit. It may be in same hosting, but it could be different machine/server. Perhaps, if it’s a shared hosting then it could be the problem since multiple sites could share resources on the same machine, and a site that’s not yours could use it up.
Thanks!