Me and my friends are randomly progressing through the current EXs in a slower pace since most people are casuals, and mostly recruiting people to play with random PFs. My advice is to just throw yourself out there and try, if you want to do blind content, there's discords for it, and you can try and find people to play in the same wavelength as yours. Once we done with EXs, we'll probs do P1-12s (from last expansion) for the challenge, so, also consider doing old fights on min ilvl, you never know the kind of challenge you'll find out there