Is it okay to just stick to the obligatory prayers?

As-salamu alaykum. I started being consistent with my salah back in 2020, but since 2022, my mental health has really taken a hit, and it's affecting every part of my life, including my deen. I've been dealing with some really dark thoughts and some days just getting out of bed feels impossible. Focusing on anything is a struggle, and it takes hours to push myself to get things done. Honestly, everything feels like a huge burden. I've gone through phases before where I stopped praying completely, and the thought of that happening again-or worse, losing my faith altogether-really scares me. For me, prayer was how I talked to Allah, but after years where things haven't improved and have even gotten harder, sometimes I find it difficult to feel His mercy. It can feel like I'm being punished for something and I don't even know what. So, my question is, would it be sinful if I only manage the fard prayers? I'm really just trying to hold on to that last bit of connection and faith that keeps me going.