Controlling drums enough to satisfy neighbours is tough, as drums are loud and neighbours difficult!
Acoustic panels will reduce sound levels within the room, but will only marginally reduce transmitted
sound. Totally covering the windows always brings some improvement (with plywood and insulation),
as does insulation in the ceiling. If it’s a brick house, this may be enough. If it’s weatherboard, the whole
place will still resonate like a big drum.
The best solution is to build a drum booth within the room, which is expensive, but effective.