Instead of only mention the
decentralized hosting and
decentralized domain name system, you should recommend which the web hosting and the DNS you refer to, I don't think that's possible. Mirror site won't solve, you're only play hide and seek until they discovered all the websites related to Bitcoin. The only way is run the site in darknet instead of clearnet, if Bitcoin is completely got banned in anywhere.
Somewhere in the future china (2027-2030) will be the most dominant superpower would ban / sanction bitcoin.
China completely ban Bitcoin since 2021, why Bitcoin and this forum wasn't get banned since 2021?