Juve have done alright because they're a big club but more importantly, because they're currently ahead of the curve in Serie A. I think they're the only club in the division that isn't renting a dated municipally owned stadium so they're able to generate their own stadium revenue and keep it all.
https://www.football-italia.net/109571/juventus-stadium-boosted-revenue
There's already been rumblings about whether 40k was ambitious enough, and in coming years other Italian clubs will also have their own stadiums and some of them (e.g. Roma) will be bigger. It'll be interesting to see whether Juve stay ahead when that happens. They've stolen a march for now, but it might not last in the medium-long term.
Everton are in a completely different environment. An unambitious stadium may have transformed Juve's situation recently but even an ambitious 60k+ stadium isn't going to put you Top 6 in terms of revenue in the PL. That's the difference. They could do a fast walk and overtake everyone in Serie A, you'll have to run to even stay on the coattails in the PL. And of course, an unambitious stadium will have you even further away.
55k is surely the absolute minimum you should be aiming for.
Anyway, will leave you to your goalfest.