I've taken the next step in reducing Microsoft's presence in my life: I've just notified my mother that I'm cancelling my subscription at the next renewal and she will be back on the free plan.
It is not much of a sacrifice as I still have full access to all the programs through both work and uni, but I won't be paying them (which was primarily for my cloud storage). I might look at LibreOffice at some point, but the main thing I use is a complicated spreadsheet for my budget and it is highly likely something will break if I try it in a different program.