The volume of either approach and either end will depend on your capacity going in.
As your instinct tells you to go with L-to-S, that’s where to start. The next step is to think about what you did in the previous training year, even if it was S-to-L. How tolerable was it?
If it was stressful throughout, you need an easier progression, and, if not, a similar progression.
Typically (but not specifically!!), a L-to-S SPP might start with 2 x 300, moving to 300,200, 250, 200, then ending around 250 as a single SE run before competition. The SE would likely occur once a week for a masters athlete.
You’d like to keep the overall speed training volume fairly level until the final two weeks where the speed vol would drop.