Master of Some [Apprenticeship]

Requires Jack Of Trades Feat

Choose one tool, instrument, or gaming set in which you have
proficiency. You gain expertise with that tool, instrument, or
gaming set, which means your proficiency bonus is doubled
for any ability check you make with it. The option you choose
must be one that isn’t already benefiting from a feature, such as
Expertise, that doubles your proficiency bonus.