how to play tanks?

Always have the repair tool, ideally you have a squadmate or someone to do it for you. They person repairing if it’s not you can just on top towards the back and go prone so they can repair while you move. Also that’s a terrible angle, maybe come from farther right so you can aim better, from there it looks like your shots will whiff or only get a hit marker. 

thermal smokes is a must, I’d repair (tanks repair ability) after the first hit, don’t wait till you’re half life or lower, every Lis within 1000 miles will know and you’re done.