Assuming that the current covid wave doesn't turn into a full-on surge, my plan is:
Get rsv vaccine this week. It's good for over a year so there's no worry about it fading at an inconvenient time, and it gets the shot out of the way. Plus there's some research indicating that spacing adult vaccines apart very slightly improves their efficacy.
Get covid vaccine sometime in the last ten days of October (assuming no covid surge in the meantime). The mRNA vaccines seem to be most efficient during the first four months, so a late October shot gives me full protection for all the winter holidays, as well as the main heating season (Nov-Feb, inclusive).
Get flu vaccine first week of November. Flu vaccines seem to be most effective for three months, so that gives me the most protection from Thanksgiving through Valentine's Day, plus the little boost from spacing out the shots.
I'm going with GSK's Arexvy for RSV (seems a bit more effective than the other two options), Moderna for covid (slightly stronger than Pfizer), and Sanofi's FluBlok for the flu (again, it's the strongest vaccine available for my age group).
Edit: my scheduling is based on my own vaccine and health history, and local virus circulation. If your area is having a surge, if you're under-vaccinated, if you have medical issues, you should consider your own situation to figure out your own schedule.