More sets.
Rep ranges are more about optimizing across a few different factors. Basically, your rep range you should be one that lets you accurately gauge how close you to are to local muscular failure, gets you to local muscular failure without overly fatiguing you in other ways or getting you to failure somewhere else first, doesn't give you joint issues, and doesn't take forever to get through. In practice, for me at least, this means I try to keep my reps per set in the 8-12 rep range.
There's been a good amount of research done on # of sets over the past few decades and the studies are pretty consistent. Assuming the set is take 0-3 reps from failure, we see growth happen even at ~5 weekly sets. The more sets you add, the less additional hypertrophy you get per set, but studies have gone up to 40 weekly sets and still seen growth continue. There are some tiktok influencers that try to claim this is edema, but some of the studies have use muscle biopsies to help measure the growth and these match the results - something edema would not show. We don't have evidence that 40 is the cap, either, it's just the studies haven't continued beyond it.
For me, the 15-20 weekly set range is about where I personally feel the reward:effort ratio makes the most sense.
This is assuming you can recover from the volume - you're not going yourself any good training more than you can recover from. There are lots of factors in determining how quickly you can recover, and lots of things can cause week to week variance, but if you find that long term you're just not recovering and other tweaks to diet/rest/etc. aren't doing it, backing off on volume makes sense. As you get stronger and have to keep working with heavier weights, you might not be able to keep up the volume for every muscle group. In some cases, it's total volume - if you're trying to increase the size of your arms and your legs are already where you want them to be, maybe drop down to 10 sets per week for quads/hamstrings instead of 20, and see if this lets you keep up the arm volume you want. Sometimes it will, sometimes it won't. There's lots of levers to pull here and could be the subject of quite a few paragraphs of discussion in and of itself.
(This is all per muscle and sets can be counted in a fractional manner, particularly for compound movements. The primary muscle might get a counted as full set, the secondary half a set, tertiary a third of a set, etc.)
TLDR: As long as you can keep recovering from it, more sets per muscle per week taken close to or to failure has not yet been found to have a cap where you stop getting additional growth. There are diminishing returns, and the higher you get, the more the ratio shifts.