There's a ton of pressure on Tatum and Brown to improve this year. They heard the trade rumors for KL and AD and those deals falling apart because of the Cs refusal to include them.
The Celtics chose the long term play instead of the short term and now it's up to them to respond. Any talk of wooing future free agents is 5-6 years ahead of time because any of their peers (that's worth wooing) will be locked in for the next 5-6 until UFA.