Ok to go straight to the point I only drive Sports Car Series (Mainly GT3)

The thing is I’m quite new to iRacing and sometimes it’s hard to have every track for every event specially the IMSA (A Class event) which leads me to my point if I can’t race some weeks on A Class cause I don’t have the track do I lose my license or as long as I keep my SR good I don’t have to worry ever again?

For record I’ve been having a blast on Sprint Series (B Class) and GT3 Endurance on the Weekends (C Class) and I’m afraid to stick to those more while I don’t have all the tracks or when I don’t wanna do IMSA or even if I want to go back for the eventual MAZDA/GR86 race and by doing so eventually I’ll lose my A Class license.

For the record I’m A Class with 3.59 SR (On track to 4.99 soon I hope).