These all seem like shit options, frankly.
People seem mighty on board with ads since it gives the illusion of not requiring them to pull out their wallets, but that shit can burn a hole through a website really quickly. Nothing is free. You're not going to have much of a benefit of choice in regards to having "safe" and "unintrusive" advertisements; you guys run a pirate site, and you host porn as well to boot. You'll have to resort to weird splits like "removing advertiser-unfriendly content", either permanently or to another site like SadPanda did. You'll be chasing advertiser's whims just to stay afloat, especially since donations will dry up even further, and the site will continue to suffer as a consequence. Forget "safe and unintrusive banners", you'll barely have a say on what you get with seven servers and counting.
All of this counts doubly so for affiliates, who are likely going to be even more scrupulous about content.
Crypto is garbage however, and if you were having trouble before with donations expect even the slight barrier it takes for people to learn how to pay through it to turn off 95% of potential donators.
The best option would be direct server donations, but 50-70$ a month is a hefty price for an individual to cover. Discounting 2-3 charitable Samaritans with plenty of disposable income, you'll be paying for most of it out of your pocket.
I won't vote for an option, since I can't say I like any of them. I'd suggest continue looking for alternative routes where there isn't as much a barrier for direct donations. Maybe set up a phony Twitch stream/podcast reviewing scanlator groups/manga (with no technical affiliation or links to Mangadex), set up a Patreon for that but use the gains to fund the site? Or that Minecraft server that was suggested. They're goofy ideas, but frankly I'd still find them preferable to any of the proposed solutions.