Looking for assistance with communication.

I’m a man in my 50s, and I’ve been married to my wife, who’s in her mid-40s, for 20 years. Like many couples, we've experienced our fair share of ups and downs. Overall, we’re somewhat content—I wouldn’t call it happiness, but we’re not unhappy either. I sense that she’s more at ease with our situation than I am; I wish we could spend more time together, but neither of us is contemplating a separation. However, I’m beginning to feel overwhelmed by the way we communicate. She often tells me that I have a tone she finds displeasing. I try to be mindful of this, but I can’t deny that it happens. When we argue, she tends to raise her voice and interrupts me before I can finish even a single thought. She jumps in with her own assumptions, completely disregarding what I was trying to articulate. It feels like she’s not listening at all—she doesn’t engage to understand; she only hears enough to react. When I attempt to discuss our communication issues in a calm moment, she seems frustrated and often cuts me off. In the two decades we’ve been together, I can recall her apologizing to me only three times. I acknowledge that I’m not perfect, but I’m starting to feel emotionally drained. I’ve attended individual therapy, where I’ve gained insights into my communication style and my reactions to her words. Unfortunately, she’s not willing to pursue individual therapy and stopped attending couples counseling as soon as the discussions turned serious. I’m at a loss for what to do. I want to make her happy, but I’m unsure how to achieve that anymore. I struggle to find a way for her to listen long enough to grasp my perspective. I feel lost and need guidance. Thank you for your assistance.