I think the point is not to limit growth by negatively affecting a portion of the site's visitors, but to get more money to support it.
Off the top of my head:
1. Have someone write/link a guide to crypto, since it seems a lot of people are stopped by how confusing it is.
2. Have an area of the site that shows the amount needed to keep the site running and how much has been raised so far that month.
3. If people are willing to do this, have people send their donation money to trusted, long term crypto donators. Have them be very transparent on where the money is going, maybe input a money cap so each crypto donator can only pool like $100 or something.
4. Have some kind of premium but inconsequential service? But then again, that might be off the table if it requires personal details.
5. One day a week or maybe a daily prime traffic hour where you run ads.
6. I've seen people say that you should have an ad page and if that's plausible it sounds like a good idea. Maybe you could tie the premium service to it, and you earn coins whenever you view ads? Coins could be used to buy avatars, awards, (like reddit gold but bought with ad coins) ect.
7. You could even partner with any willing translation teams so users can buy their delayed releases with coins earned from watching ads.
8. Ask solo leveling readers (in the comments or in discord? ) to delay how quickly they get to new releases. Personally I'd be fine with checking in a day later or something.
The transparency is very appreciated. As long as ads are SFW, don't interrupt the reading experience, and don't force me to click on them, I'm fine with them, and I think most people would be too.