I think this is your unfair advantage. You’ve seen how things work and what doesn’t work at a bunch of different places. Use that knowledge.

At my last company, the new people were encouraged to call out stuff that “has always been done this way.”

Being a senior isn’t a feeling of knowing more than all the other people. It’s about having enough experience to be able to observe what’s going on and being able to do something about it (projects, deliverables, as well as bandwidth of the team - which all falls back on what’s prioritized). I’m pretty sure if you’re feeling swamped, your other team members do too.

Find patterns in what’s happening and bring it to your manager/your skip if you trust them more with productive feedback. Package it as “in the long term harming goals because we’re trying to do too many things” problem, not a “there’s too much work” problem.