Want to ttc again but no period while breastfeeding

Carrie • 💕46 1/2 yr old Mom of 6 Sunshines🌞, 1 Angel👼🏼 & 1 Rainbow 🌈

I am 42 1/2 years old and I have an 8 month old. My husband and I want to ttc another but I still haven't started my cycle. I'm solely breastfeeding. She eats cereal, just started 3 weeks ago, but she doesn't eat but 1x a day. She's just not interested in food though I still offer it. Is there any point in actively ttc without a cycle? With all but my last 2 children, I resumed a very predictable and regular 28 day cycle at 6 weeks post partum. My last one prior to my current one, I was 38 years old and resumed at 6 months. Any experience or insight? On top of it he leaves in the summer months for a year of schooling and we may only see each other once every few months. Does doing bbt do anything or opk if I'm not having a cycle? Thank you for any insight!