But when Dick was in the NTT he was also still part of the younger generation of heroes. There weren't all these other generations of heroes behind him like there are now. He is an adult hero and needs to be treated as such. I think just pushing him off to look after younger heroes doesn't really fix any of the problems he has. It is lumping all these lower gen heroes together because DC doesn't know how to incorporate Dick with adult heroes. It doesn't work.
The ceiling that Dick is running into now is that he is an adult hero but he isn't allowed to be looked at with the other adult heroes that are in the JL. Dick isn't even allowed in the JL which is a problem too. That Abnett Titans issue where Dick was walking into the Hall of Justice and was supposed to be in awe of statues of the JL heroes was insulting. It was such a joke. Him being in awe of some heroes that haven't even done as much as him. And of course all the problems with Batman and the JL treating him and the Titans like children.
What needs to happen is that Dick should join the JL. Become a full fledged JL member and be looked at and treated as one. There is no reason why he shouldn't do this. Him just being a Titan but being able to use JL facilities doesn't cut it because it doesn't get rid of the ceiling he is running into. This doesn't mean he has to lose his Titans connections, or even get rid of the Titans team (heroes can be part of multiple teams), but that barrier of him not being allowed in the JL needs to go away.
He can still be the go-to for mentoring the younger generation if you want, it can be one of his official JL responsibilities, but he needs to do this as a full JL member. They can even have Dick be the liaison and the go-between for the JL and Titans as part of his role. A full member of both teams. There is zero reason to put Miss Martian in this role when Dick could do it better.
It doesn't matter that Dick in the JL won't be treated or looked at as the same as the founding 7, or even used in the JL book that much. No one that joins the JL will be treated the same as them anyway, but it gets rid of that obstacle of other adult heroes not treating Dick as an adult. He he would be on their level and that barrier is gone. Then if Dick messes up him being in the JL means that Batman and the other JL members can properly punish Dick because they actually have leverage with also being JL members. They would be able to strip Dick of responsibilities or even kick him out of the JL. So that whole story Abnett was trying to do with the JL punishing the Titans when they should have no control or influence over the Titans team would make sense in this situation.