Moves I'd make:
1. Get rid of the DH.
2. Four teams from each league in the playoffs, each round a best-of-seven format.
3. More true doubleheaders.
4. Expand rosters- this'll placate the union that'll be upset about losing the DH (which'll have the effect of lowering contracts) and make the doubleheaders more manageable.
5. Each team plays two interleague series a season. You either get matched up with a geographic rival (Mets v. Yankees, Dodgers v. Angels, etc.) where each franchise gets to host a weekend series or you can rotate among the teams who don't really have a true rival.
6. Make the All-Star game meaningless again and simply alternate home field for the World Series.