Overcoming Negative Thoughts and Overthinking

As-salamu alaykum. Lately, I've been having a hard time with too much free time, and it's led me to overthink everything. I keep questioning Allah's decisions and comparing His decree to my own situation and others'. I know in my heart that Allah's wisdom is beyond our understanding, but my mind keeps wandering into doubts and obsessive thoughts. This has been going on for about a year now. I need some practical advice-maybe a podcast, book, or technique-to help me stop this negative cycle. Does anyone have suggestions? Jazakum Allahu khairan.