As for me, for 2021 I read 6 chapters per day, 3 chapters in each Testament. That method took me through the entire Old Testament in 10 months and 1 week, and it took me through the New Testament 4 times. Instead of waiting until the turn of the year to begin the Old Testament again, I just started again the next day after I finished it. Today (12/26), for example, I'm in Numbers 31-33 and Luke 1-3 (probably my favorite Gospel, by the way).
Also, if I came to the end of a book where, at 3 chapters per day, I found that there would be one chapter left hanging (the last chapter of the book), I just added it to that day's reading - so, 7 chapters that day instead of 6.
I plan to continue this same method next year. I'm also toying with the idea of doing a special reading through the Book of Psalms using Matthew Henry as my guide.