You know I would suggest a SRO just like isro,
Heavy rates , 1x (But enhance quest rewards)
Silk expensive , so it worth again and not everyone runs with full Silk items around (I know seems a bit pay 2 win but if ur good you can farm items sell for silk , I mean make it expensive so u cant have for 5€ prem+ dress+ devil , 5€ prem+ is fine too)
Make Sun weapons rare , tbh just make it like isro it was always the best until D12 came out.
And pls no over editing , fk this coin system or rebirth.
Just make Bot (trivia) which ask in globals , u give correct asnwere , u get little silk reward

. Make a Grand opening and post a thread about the server , open it 2 Weeks later as u posted and always bump it so many ppl join