Ay, congrats on 7 months, mama! Good news lang, breech babies often turn on their own pa until around 8-9 months, so you still have time. Most mums I know who were worried ended up turning naturally, kaya don't stress too much yet.
From what I've heard, pelvic tilts and hands-and-knees positions work best, you do pelvic tilts (on all fours, lift your hips up slowly, hold, repeat 10-15 times daily) and just spend a few minutes hanging out on all fours to open up your hips. Someone in my mum group swore by side lunges and downward dog stretches, too, basically anything that opens your pelvis and relaxes tight muscles. The idea is you're helping baby get comfortable flipping head-down naturally.