Difficulty making ‘mum friends’ rant/moan/offload

I don’t know if it’s just me but the struggle to make mum friends is SO real!!! I just don’t understand where I am going wrong. My daughter loves being around other children so I’ve tried to make friends with other mums. It starts off very well and then just fizzles out?? I don’t know if I am doing something wrong or….? Also anyone else feel as if baby groups have become very ‘cliquey’ where mums have formed a friendship and unwilling and unbothered to talk or make efforts with anyone else?! I’m genuinely so bored of doing the same thing with my daughter and I just know if I had a mum friend with similar interest it would be so different! I’m really just trying to make the most of my maternity leave but it can feel VERY lonely at times.