Give up or change coarse, there is a difference. Not seeing a return does not always mean not making an impact.
Wanting to give up because there is no tangible measure of forward motion is very often a emotional response to a bad day. There are always better ways to achieve a goal, relook at the approach, re-engineer the objective and change the coarse.
Very often the concept of attaining success will take a whole lot longer than you can possibly imagine. That does not mean that you are on the right path, it just means that patience is required to ensure you are doing the right things at the right time.
No, don’t give up.
Be patient and persevere.