Here's our monthly splits up until the game vs Detroit.

Definitely the metrics are better. But as others have mentioned, we need to take them with a grain of salt given the quality of the opponents:

But end of day wins are wins and tempting as it is to diminish the team's achievements due to the quality of their opposition we weren't winning these games earlier in the season. Our wins have coincided with the team being healthy, and with a clear pecking order in the rotation (some aren't happy with Ime just using 8-9 players in the rotation and not seeing the kids playing but there's no longer and odd lineups due to Covid or injuries).
We are fortunate that we have one of the easier schedules in the league for the balance of the season but every team needs some luck to try and make a run and build good habits. I've had this feeling through the season that while we have some fundamentals gaps like shooting, this team's main issues are mental and building winning habits even against easier opponents is important. I really think that Brad and Co will double down on this season and try to make a deep playoff run, and do what they can to improve the team without going overboard.
Wins are wins, and it’s not like the teams ahead of us in the standings (whom we have a winning record against as a group, fwiw) don’t also pick up a ton of wins against the bad teams, and they happened to have more of those games early in the year. And again, we’ve been dominating the bad teams lately — no squeakers (excepting Friday where we could have won by 30 but for garbage time living up to its name). The Celtics are playing like a top team, have been for 5 weeks, and their season-long numbers, record included, are starting to catch up to that reality.
That said, I don’t see the Celtics doubling down, per se. Because of the disparity in quality between the top 8 and the bottom 5-7, the success is very tenuous. I don’t see ownership feeling like being a tax team, so having room to add salary is limited. The Celtics also aren’t likely to want to trade any significant asset for a rental. If there’s a player on a cheaper contract with a year left, I could see them trading Romeo/Nesmith and some of their useless contracts (Fernando, Bol, Dozier) to acquire such a player. I come back to a guy like Justin Holiday as an example, who’s only paid ~$6 million this season and next, which is barely more than what Romeo’s paid next year. Swap out Romeo for such a player and you’re a better team for the same cost.