I would add more content. Only 2 articles have been published this year in 2022, and prior to that the last articles published on the site was 9 articles in May 2021.
So there is a lot of room to grow the site purely by ramping up content creation. The site has however continued to have stable traffic for a long time and been through quite a few google analytics updates now and faired well.
Currently there are four content silos (gaming keyboards, gaming chairs, gaming desks and gaming monitors) with a good mix of info and review posts. "Gaming keyboards" was the first silo created when the site was started and the most comprehensively fleshed out currently. So I'd also look at continuing to flesh out the other existing content silos more, before adding more silos thereafter (gaming mice, gaming headsets, gaming laptops, etc).
Other than more content, there's also an opportunity to immediately start increasing revenue by adding adverts to generate extra revenue. The site has already been approved for Ezoic ads. I had Ezoic ads running for about a month last year but turned it off purely because I was worried that it might impact the site speed and Google had mentioned page speed was becoming more of a ranking factor. But it's certainly something I'd relook at especially if traffic is increased.