The way you go into doing something, determines how you are going to experience it. You do something with the mindset: pff alright, let's do it (because I have to). It is never going to be fun. You should do things that excite you. You will be more efficient, you will enjoy it more causing the quality to be higher... well to be fair the fact that you enjoy it more should already be enough reason.
If you are in the position that you can choose what to work on, great, go look for the things that you think may excite you. If you aren't, even telling yourself that it will be fun will cause you to look more for the positive moments. And try to look for things to balance it with. Find projects that you can do on the side, doesn't matter if they don't pay, do it to find the joy back.
That is something I am trying to do as well. I notice that sometimes when I have to do something, I am reluctant. I still do it, I still deliver, but it is not optimal of course. The enjoyment can always eb and flow, just have to ride it out. But in the meantime, tricking yourself in liking it by looking for the positives and balancing it with other things and not judging yourself, is the way to go.
