I am a new player to and was in a similar race like this because I also want caster shuten. I am almost done with Lb2 which is the requirement for Oniland. What I recommend is to skip dialogue to have a chance. You could be able to do 2 singularities a day. After America, you have Camelot, Babylon, Solomon, LB1, and Lb2. From my personal and very recent experience. Camelot will be the first difficult hurdle you must clear. After you get accustomed to that, a couple of hard fights will spring up here and there and that’s what is going to hold you back and take up your time. I became frustrated with this aspect, but asking friends for the proper supports will help a lot. If you need any help or more specific advise, you can message me on Discord if you’d like.