Maybe it is similar to working from a different place? (e.g. coding sitting in park instead of the same old office day-in day-out)
Another example is "productivity apps". I was using one for ~1 year and it was going great until the last few months. I simply changed to a different one and now I'm using it much more than I was. I think just changing the stuff you use all the time is something that is under-appreciated
Most likely that will build momentum.
Can also try accomplishing a small not-work task like laundry or something to solve it from the other end. (You’ll feel like you can take on bigger pieces because you just accomplished something)
Lastly reading the specs or playing with the app with no other windows open and eventually boredom will take over and you’ll start making bits of progress.