Upgrade White Macbook to Mojave?
macOS Mojave is only compatible with MacBook models from 2015 or later, i.e. the 12" Retina models. (There were no Macs just branded MacBook released between 2010 and 2015; Mojave supports MacBook Air and MacBook Pro models back to 2012.)

The latest macOS that will run on your MacBook is 10.13 High Sierra. 

Only you can decide whether the performance will be OK for your usage, so I would suggest you try installing High Sierra and see how you get on.