AdSense is earning far less than I expected. How do you decide whether a small tool site deserves more of your time?

AdSense revenue from my website is much lower than I expected, and I’m trying to decide how much more effort to put into it.
I run Mouse Polling Rate Test https://mousepollingratetest.com/, a free browser tool for checking mouse polling rate and stability without installing anything. The site also has keyboard and click tests, along with guides for understanding the results.
It’s a fairly specific use case. Someone wants to check their mouse, compare settings, or investigate a problem. They can run a test and get an answer quickly.
That makes the monetization question awkward. A short visit could mean the tool did exactly what someone needed. But a useful visit doesn’t necessarily produce much advertising revenue.
With AdSense earning so little, every improvement comes with another question. How much time can I reasonably spend on something that’s still a long way from paying for that time?
I’m hesitant to respond by adding more ads. For a testing tool, keeping the page easy to use matters. Making the experience worse would feel like a poor trade, especially without knowing whether the extra revenue would be meaningful.
I’m also wondering whether advertising is the right model for this kind of site. Hardware affiliate links could fit some of the existing guides. A relevant sponsor might be another possibility. Both would need care, particularly when people are visiting to get an independent answer about their equipment.
The option I’m considering is to give the project a limited budget of time, choose one monetization experiment, and set a review date. That would make “keep going” a decision I can evaluate, rather than an open commitment to keep adding features.
For anyone here who runs a free utility site, what helped you decide whether to continue investing?
Did AdSense eventually become worthwhile as traffic grew, or did you find a different way to support the site? I’d especially like to hear from people whose users arrive, complete one task, and leave.