A good PG would be a start.
Something needs to be done in a fairly timely manner.
I'm frightened to head into the 2023-24 season without a substantial plan in-place to drastically improve this team. That begins in the 2022-23 season. This coming summer.
The reason? JT is a free man, he can sign with any team he likes... and unless the Celtics look especially enticing in that final season, he'll be wearing the Purple and Gold. He'll say all the right things, and thank the fans in Boston, he'll always have a warm spot in his heart for the Celtics organization, blah blah blah, as he boards a plane heading to LA.
I wouldn't be surprised in the least if it were for less money too.