I started watching weeklies with OOO, so I'm another long-term viewer. I recall hearing somewhere that the average amount of time someone spend in a fandom (of any kind) is five years, so people such as you and I are definately in the 'diehard fans' category.
Toei themselves only expect their main audience (you know, those kids in Japan) to watch for a couple of years before moving onto something else. I remember when the first Super Hero Taisen movie came out, Fourze was the current Rider, and there were reports of kids coming out of the cinema wondering who Decade was, because he was before their time.
There's certainly times when I've lost interest in the current output. Sometimes I wonder whether those kids have the right idea. They get in and get out again while they're still finding enjoyment from it. It's not like these shows have some deeper layer to them that you'll only understand if you've seen a bunch of previous entries.
I don't think there's a solution to it that works for everyone. Personally, I often find that after a while some weird form of FOMO drives me to catch up.
I often find that keeping things varied is a good way to keep my hand in toku. Jumping between franchises and eras stops things becoming too much of a repetitive grind. Recently, I've been checking out Guyferd (from the 90s) and the new subs of Japanese Spiderman (from the 70s) and it's different enough to the currently releasing stuff that it feels pretty fresh again.
Skipping/dropping shows if they don't interest you is fine. Taking an extended break is fine. Ultimately, this is supposed to be entertainment, not homework.