I have some ideas for new boosters, maybe developers could bring them to the game:

Luck booster - while it's activated player would be able to open 2 boxes from 9 using 5 clovers at a time.

Task booster - while it's activated player would be able to pick and complete 2 different reggatta tasks at the same time.

Reggata point booster - while it's activated player would get 2x or maybe +some percents more reggata points and/or reggata tokens for each completed tasks.

Building booster - community buildings, zoo buildings and houses would build 2x or -some percents faster than usual.

Mine booster - each ore found in mine would count for 2.

Mine tools booster - mine tools would break more stones - pickaxe would break two stones in a vertical ax, dynamite would clean two rows and TNT would break 5x5 area.