hard grinding for bells

I requested the backroom upgrade that cost 348,000 bells but as soon as Tom nook said it be ready by tomorrow I freaked because I don't wanna pay by nook miles. So I'm grind fishing for bells. And I have 135,000 bells to go but my switch needs to charge but I don't wanna wait for it to fully charge cuz it's 8 right now and the nook cannery closes at 9. so I have it set for 30 minutes worth of charging time. Tom's prices are ridiculous.