how do you keep track?

The business I am is a part of a wider group which is currently undergoing a growth phase where it has acquired 3 new businesses in the past 12 months. My executive and his senior leadership team is very much involved in these mergers on top of daily operations. There are so many moving parts and I am losing track of decisions being made in meetings and failing to make follow throughs. I've tried to use systems like Monday.com etc and manual old school lists but that quickly gets overwhelming. I feel like I'm failing. What can I do?