Thanks for submitting your feedback and showing interest in our server! However to start with the top part;
We have plans to bring more 1.17 servers as 1.8 is becoming more buggy and causing more issues as a whole and we need to move on from it at some point.
We don't really have any plans to bring OpFactions nor Factions back anytime soon if at all.
Adding staff isn't just a case of adding staff, people have to apply and be accepted which people are all free to do here:
https://www.extremecraft.net/applications/new/1/
Holding tournaments and events are planned currently.
Advertising is something mainly Dieu and NxDs would do but mainly Dieu and it's being worked on at the moment.
If there are any suggestions such as event idea etc.. you and anyone else is able to make suggestions and they will be seen.