Tapasya means to act according to the responsible occupation we may have in life but to never perform any activity unfavorable for spiritual advancement.
Human life is meant for austerity. You are human so do austerity, whether you like it or not!
Austerity is all about making the right choice.
When one performs austerity, one immediately becomes dear to Krishna’s heart.
Austerity means putting aside our selfish ambitions for a higher purpose.