Some say it was a day of rest for our Lord. They think Jesus took the day off to be strengthened in soul and body. That may well be true. Jesus was kept a wearing schedule, with greater intensity to come. First, as we have already noted, we don't have to know everything.
Life is full of questions without answers.
Honestly, we just don't know. If Jesus did rest on Wednesday, it was because it was the perfect thing to do. If he preached, taught and healed, THAT was the right thing to do. You see, whatever the Lord chooses to do in any situation, is the right thing to do. Perhaps one day you may meet someone in heaven who became a believer or was healed because of what Jesus did on Wednesday.