1. A donation link in the footer... people only see it if they're looking for it
2. More overt reminders (when KDE added a single yearly popup notification, donations dramatically increased)
3. Adding tiers to step up the donations (e.g. maybe you could convince most of the $3.99 folks to do $4.99)
4. Adding rewards to fuel the funder's egos (I try to send personal emails thanking them but this isn't an explicitly mentioned 'reward' unlike, say, positions in the credits)
5. In addition to rewards, supplementing income with sponsors. The sponsors frequently are exploiting both the creator and the consumer (e.g. Honey), but nevertheless compensation does increase. Also, affiliate programs. Hard to do without your own integrity being compromised when recommending products.
6. 'Dangerous' monetization that plays with emotions. Onlyfans creators creating pseudo-relationships. Entire sponsored videos for stuff like gambling.
Of course, it is hard to argue that the oft. underpaid content producers are really the ones making ethical concessions when they exist under a system that... underfunds them... but nevertheless it is undeniable that there are ethical concessions, and these concessions are made because they increase revenue.
The really really sad part is that you really only see big creators throwing doing this stuff despite already having more than enough, and they always get away with it, whereas if a small creator were to pull this their audience would eat them alive.