developing a wordpress site

first of all i only need native tamil speakers, writers only to do my job because they can easily understand my need My website name is [login to view URL] it is a wordpress site. check my website in desktop and mobile. go through some posts in my website. i am using publishable mag theme currently. i strictly dont want to change the theme. i need someone who have a strong knowledge in css and style editor. The following problems have to be cleared. In mobile view my post making large right side and left side empty space which makes ugly to the viewers. i uploaded a screenshot. if you want to be more clarify then visit [login to view URL] in your smartphone, visit any one of the posts of that site. I just want my posts must be similar to the site. I searched many better fonts for tamil. but i cant find anyone. you can find out my website post fonts are too small in mobile view. i just want better fonts in both desktop and mobile view. just visit /[login to view URL] and go through any one of their article. i want my web posts fonts similar to them if possible. you can edit font height anything in my theme. But make sure i need better fonts with correct height and etc... visit my website homepage in mobile. i feel it is very ugly. just visit [login to view URL] in mobile. I need to correct post feature image size to on left side. make my homepage posts better. after that check my site in google mobile friendly tester to make sure everything fine at last change some minor changes like colour to make my site beautiful. just chat with me what are the things to be changed. if any major change i will pay extra amount.