How do I get a higher tolerance in 3 years?

My sister is getting married in 3 years and I am the lightest lightweight to ever lightweight. Like one twisted tea and I’m already out of it lol

She said either I don’t drink much or I figure out how to up my tolerance before her wedding as I am her MOH

HELP

(Also I don’t have time to drink much between workdays which is another problem only off Thursdays and Saturdays)