You can move reply button to left by changing post menu settings in admin side /admin/site_settings/category/basic.
I don’t think it is better. It easy to me for right hand side. I like current position. Let’s check what others say
And if you want Reply button bigger then you can do using simple css
.widget-button.reply {
font-size: 18px;
font-weight: bold;
}
And add your css customization in admin side /admin/customize/css_html