Keep your reel spool filled to capacity.
Don't use line that is heavier than what is recommended for the reel.
Match the rod to the reel and the chosen line class.
Braided line often casts farther than mono due to its much smaller diameter for the same breaking strength.
When possible, use small wind-on style knots, which allow you to reel the lure close to the rod tip, where you'll have better control of casting accuracy.
Acquire the touch so you take advantage of the top one-third of the rod to execute your casts.
After casting a spinning reel, manually close the bail. This helps reduce the line twist that can substantially limit your casting distance.
Inspect guides for the slightest nicks and abrasions, which can interfere with casting distance and also damage the line, ultimately costing you a fish.
Change line regularly. Finishes on monofilament and braided lines reduce friction, which results in longer casts.
Freshwater washings are essential for removing salt from the reel and line. Salt deposits on fishing line and the spool will hamper casting distances and accuracy.