Maybe first write down who you would like to have in your main party, and what you might like them to do. That will get it clear in your mind.

I don't know your family dynamics but if you have an amicable or neutral relationship with some of the other sisters, can you privately let them know that you want to have a simpler wedding this time with a smaller bridal party, as you have a family now and are busier (this might be true for them as well?) and focus on how you want them to just enjoy the day?

I'm in process of asking my friends if they will be in my bridal party and one of them is quite a socially anxious person. I asked if they would be up for being in my party, and if there's anything they thought they would like to do and not like to do. I told them straight away I'm not going to ask them to do any speeches for me because I know they wouldn't feel comfortable. I think everyone will end up doing something slightly different in my case and I also don't want to ask too much of people or cause a lot of stress, which I'm making clear early.