A decent tripod for resting your rods on while fishing, and a seat tackle box, are certainly worth the investment. Not only will the box store all of your items safely in one place, but you can use it to sit on too, while watching for bites in comfort.
Another good investment is a beach brolly or shelter. When the wind or weather takes a turn for the worse, it’s always good to have somewhere to retreat to and take cover.
Buy yourself a rod holdall or quiver bag. You can slot your rods inside and strap a tripod and shelter to the side, making it easy to carry to your mark. Store all your rigs in a wallet so they’re easily accessible.
A beach shelter is a good investment