A stem with a steep angle (eg, +17) should raise your handlebars 1-2 cms, and riser bars would do the same. Raising your bars would also shorten your reach, which looks like you might need given how your saddle is rammed forward.

Your bike should be able to handle wider tires. Check the Scott website to see if they provide max tire size specs, or go by a bike shop and get their advice. My widest tires are 32s, although they actually measure closer to 35 mm wide, and they can handle any roads on my commute. I commute on bikes with 23s, 25s, 28s and 32s, but prefer wider tires in winter when it's harder to see potholes and other obstructions.