Robson, #2 is close, but instead of “on my daily basis” we would say “on a daily basis.” Hope this helps!

"I do this daily". I would NEVER combine the words "usually" and "basis" in the same sentence because the words serve opposite purposes. "Daily basis" emphasizes predictability whereas "usually" emphasizes the exact opposite: "To remain alive, the patient must be given this medicine on a daily basis". (Please, not just "usually"!)

4) None of them are correct. Consider either of these alternatives: I usually do this on a daily basis. I usually do this in my daily routine. I usually do this as part of my daily routine.