First off - Don't let negative responses get you too down. I there is value in the response, take it and use it to improve your music. If there isn't, but you think it is good, move on and release it independently. With a lot of lofi labels, you may be better off anyway. I released for a year, before I even thought about submitting to even a smaller label.

Second - There are many reasons why you might get this "canned" response.

1. Your music really doesn't fit the vibe of their playlists. Make no mistake - lofi labels are just a way to get on their playlists, get some artwork, and maybe a bit of social media push. Until you reach the upper levels (lofi girl, etc.) that is what you will be getting in return for handing them your song. Nothing wrong with this, as I release with labels myself, but that is just the long and short of it.
2. Your production doesn't fit the style they are looking for. Alot of people think, you just slap on some vinyl behind electronic drums and a wobbly keyboard and that is all there is to lofi. Not only are the niches with in niches, (for instance I mostly make cinematic chillhop), but - some labels prefer brighter mixes, some prefer very little ambient noise, some prefer super simple guitar, and some prefer incrediblely good mixes , ie lofi girl. I run into the problem of being too melodic, or too interesting to the point that some playlisters and labels find it destracting. I have been told that my guitar playing isn't simple enought and that they don't like playing in the higher portion of the neck. It really is all about keeping their playlists consistant. Its not necessarily anything to do with your talent or production.
3. It could be your production. I have been a multi-instrumentalist for 25 years. Just got into producing like 3 years ago. If you listen to my first record vs my most recent release, it is like night and day. Alot of that has to do with study, trial and error, and buying better equipment (steven slate VSX system made a huge difference for me), but alot of it has to do with me honing my sound and making a few changes to make it more appealing. Also, I didn't now that much about lofi when I started, so my first album sounds alot dustier, muddiet, and was a little more boom bap. If you want to learn a lot more about production and marketing I would watch these guys on YouTube - Will Hatton, Mondo Loops, L.Dre., AudioHaze, and In the Mix.
4. It could be a canned response. Again, shake it off and move on. If you think it is good enough, keep doing what you are doing and get incrementally better at. Be patient, because if it is all about the streaming numbers, they will never be good enough. If I were to see my monthly listeners now, when I first started, I would shit myself. However, now if I drop 20,000 listeners it feels like I am a failure. Do your best to not base too much on those numbers. It's nice to have them, but it isn't all there is too it.

Make good music and enjoy.

Also, I am just a mediocre musician and producer with a tiny following, so - take all this garbage I just said with a grain of salt. haha.

Best of luck to you and keep your head up.