Lia you have long said the main reason you got into vtubing is to do the idol thing. Don't lose sight of that.
On the flip side, a lot of vtubers got into vtubing to be a streamer and don't want idol stuff at all. Different vtubers have different goals and priorities the streaming side is going nowhere it will literally always be there, but idol could go away tomorrow who knows so continue to train for it and stay ready!
You dance well, and your company trusts you to do this stuff because you are ready and you put the work in for it behind the scenes and it shows when it is concert time!
https://www.youtube.com/watch?v=mjs1Tu5RMaA

Other girls get to do other things that aren't meant for you, cause it fits them and their strengths whether it be game sponsor stuff or 2d singing etc, and these dance opportunities are your opportunities because you are a dancer who has proven it and your company believes in you. I know it may feel like "well I am spending so much time for 1 or 2 concerts a year, but is it worth it?" and I would say hell fucking yeah it is worth it, because when it is all over these concerts are going to be the things you remember. They have taken you all over the world and you have met so many people because of them.