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Forget additives. Unless one happens to have gotten stuck due to you not changing oil often enough you have a bad lifter (unless it is another noise) Time to pull the valve cover and see what's what.. They are easy to change. Just pull the cover and and cam ledges to make sure they are all good good. To be honest if you have higher miles just buy a set and change them since you are already there.
P. S. A small exhaust leak can sound like a tap or a tick from an engine. Maybe pressurize your exhaust from the tailpipe and check for leaks. Just seal one side and add an air hose to the other side with a cap and duct tape it all.
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