If it's not working at all, move to something else. If you feel like you have made some progress, maybe give it another two weeks. No points staying with it for months if it doesn't help in any way though.

Other methods that are similar/easy and don't rely too much on WBTB I would say DEILD and DILD are probably best. DEILD can be similar because you will probably still use a mantra to wake you up after a dream, and DILD you do RC's often, which is good because you are used to doing things regularly to help LDing, and also dream recall helps DILD so if your dream recall is improving this can be an advantage.