Struggling to humidify studio apartment

My ~600 sq ft apartment was at 25% humidity the other day before buying a Levoit Classic 300S. It's been running at max 24/7 since I got it on Tuesday but seems to have reached its limit at the current 30-32% humidity. I think it might be being over powered by the hot dry air from the furnace (set at 68°F) and the stupid exhaust fan in my unit that is on 24/7 with no way to turn it off unless I want no lights or wifi.

I was looking at switching to the Levoit 6000s but not sure if that will solve the issue.

Update: I switched to the Levoit 6000s and it works much better and will save me from having to buy distilled water all the time too.