You obviously have to read better and avoid any unnecessary losses. Your endgame has to be superior, and you should not make any tsumego mistakes.
Apart from that, playing flexible is probably the most important idea.
At the same time, you should also see further and try to let black have what he wants, while you're working for a bigger goal that he is unable to see. There's a nice saying: "White is always trying to kill a bigger group than black is trying to save."
Another idea that is very fun to use (and that also requires you to have superior reading) is to make black overconcentrated. In many instances, black won't even notice that his 20 stones make for a solid 8 points of territory.
Since your tsumego and shape skills are superior, you will also be able to find invasions that hurt black. Frustrate him by invading right before he could close his area - or happily punish if he forgot to do so.
Apart from that, watch out for moyo potential and make a plan for taking care of it early - limiting with the idea of overconcentration could be a way.
Apart from that, playing flexible is probably the most important idea. Keep your groups light as necessary, avoid giving black an easy target, and solidify them in an active way later.