https://coddle.app/ Coddle is a service that checks if your sites are online, how fast they load, and lets you know if something is wrong. As a bonus, it takes screen shots of your sites with a selection of device options. It didn't pick up the traction I was expecting, guess this is not really something people need. I learned a lot making it though and will use it for my own sites, so not a complete loss.
You seem to have a strong focus on persona's: makers, bloggers, designers, agencies. But have you actually checked if these specific target groups need a service like yours? And if they are willing to pay for it?
The vast majority of makers, bloggers and designers, arguably will use cloud services or platforms to get their content out. Those who do host their own website, probably are either tech savvy, or rely on a third party to take care of the operational side. Agencies either go with dedicated hosting parties who include monitoring services in their SLA's already.
There's also this weird spread between individuals - bloggers, makers, designers - and agencies, which is a totally different market.
You are competing with others who offer the same service either as a part of their offering or as a separate offering but better and far more focussed. Like these guys:
For instance, you offer basic monitoring, but you also add this concept of "snapshots" and it's entirely unclear how that tacks onto monitoring. Moreover, you're vaguely stating "Coddle will help you check that your work looks tight on various different devices." and "You can choose to take snapshots with a variety of different device options too. Perhaps you could use some of these in your marketing and designs too?" So, what are you offering here to prospective clients?
The other guys simply solve one single question through 6 distinct parameters: Is my site still up? Yes or no? That's it. It's crystal clear what they do.
They focus on the quality of their service. Do one thing, but execute it to a T. For instance, by offering all kinds of API integrations for their uptime monitoring service with push notifications.
Then there's the pricing. It's unclear if those prices are per month, week or year. Also, how does the "checks frequencey" make any difference to the customer? And what does "check logs" mean? What are you actually selling here?
Moreover, the other guys offer their service - 50 sites - for 25% cheaper then yours. Plus, their pricing contains far more tiers to cater to different segments of the market.
Notice also how they don't differentiate their users. It doesn't matter who you are. The only differentiator they have: do you have this problem? Yes / No. If yes, then this is what we offer without thrills.
I don't endorse Oh Dear app. It was the first thing that came to my mind when I clicked on your link. I think you might find it useful to see a comparison on how that might help you in the future.
I think my biggest tip would be to clearly define which problem your solving, make sure you ruthlessly stick to the scope (does it help solve the problem) - no matter how interesting tech like snapshots might be - and you make sure your communication / marketing is unambiguous about the solution you provide.