I would suggest putting a project aside for a while but not giving up on it. Sometimes, when we get too close to a project, we start seeing its warts and all its faults but lose sight of what we like about it.
It may be a fatefully flawed project but it might also have other qualities that would make it worthwhile if you come back to it later.
Sometimes, if we learn new things or we give ourselves a breather, new ideas and new approaches will come to us.
So, I would suggest putting the project on a backburner for a while but do not yet abandon it … if after a lengthy rest, you still feel it is time to abandon it, then you can go from there.