Can I change the title & description.

I quite agree with iluminatus. You should not expect to use just one or a few pages to rank for every keywords. Usually, we choose only 1-3 keywords for a certain page to rank during the keyword research. If the keywords are not that closely related, it's better to create another landing page for your new keywords.

 

why the sudden need to change? Improve with related articles and BACKLINK, IF you want to re-design your site hit me up.

 

You only can remove those un rank keywords and exchange with new keywords, but the arrangement do not change it because it will affect the weight of the keywords.
Make sure you change it correctly. You can backup the previous meta tag before you change. If anything happen to your SERP you may change back the old one immediately.

 

If you don't want to rank your site for Previous keywords then its better to change them completely and submit your site again and wait till new keywords get rank.

 

Yes, you can change your title and description if you have knowledge of on page optimization or an employee who has this knowledge.

 

Ig you getting some traffic for some keywords then it is very bad idea to change the title and description. If your site is poor then think of changing it..

 

No Don,t Do this.if you will Do This ,Your Most Of Keywords Ranking Down Very fastly So Plz Be aware This......