I get the same problem. The burn out problem is mostly due to the fact that you 100% immerse yourself towards that issue. One solution is not keep a balance be

I get the same problem. The burn out problem is mostly due to the fact that you 100% immerse yourself towards that issue. One solution is not keep a balance between 3 different projects and allocate time to each if necessary. By splitting your free time between the 3, you diffuse the burn out. That said if 2 of them feel right and one annoys you, move on.