I tried setting up this question as a Multiple choice but I think it would be unfair to have people pay to have their suggestions added. Instead I will award M17 or more to each recommendation if I actually try it out (buy/download/subscribe) and I consider it helpful towards my goal of learning at least basic Mandarin Chinese by EOY 2024.

I'm a native Spanish speaker and I English very good. I have tried learning other languages in the past like French, German, and even Chinese, though I've forgotten most of everything. I usually go with websites offering structured courses and apps like Duolingo. I mostly default to reading about grammar and pronunciation and because of time constraints I also like to download some audio courses and podcasts. I haven't tried language lessons in a group setting because I like to start at my own pace, but I could see this would also has its advantages. I'm not sure what has helped me the most overall in the past.

Long story short, I would appreciate your recommendations to make this attempt successful.