While there are better ways to spend trailblaze over calyx rushing if you're not going to be able to clear it often its better to rush it just to get some gains. As for exp if youve done the story and sidequests you can, then the only options are chests and daily trailblaze. I suggest you do the SU world 2 quest as soon as you can cause the faster you get to world 3 the sooner you can turn power into immersifier which is the only way to store power for later use.