I think that, yes, 100%, you can improve substantially with practice and being taught the techniques properly. I've watched a lot of arts/crafts things on Youtube etc., and it does seem most of it is about learning techniques rather than an in-built ability.
I think it's another thing, like sports, where there are far too many poor school teachers teaching it that leave their pupils with a hopelessness and sense of failure.
Lack of the right equipment is also a major factor. Far too much emphasis on drawing things to make them like a photo, i.e. copying or trying to replicate a picture which realistically, the vast majority of people can't do, and anyway, that's not what art is about.
It's techniques like layering that are so important, and also starting with the background rather than the close-up subject. That's just stuff you can learn yourself and requires no "artistic ability" at all.
My OH hasn't an artistic bone in his body - couldn't even draw a stick man. But, he has a hobby - model railways, that involves a lot of creativity, craft, and, yes, art! He basically builds "3D" artworks in the form of hills, buildings, waterways, backgrounds, etc., which are very impressive indeed, often built from waste plastics/cardboard to build the 3D effect, then lots of scatters, paint, resin, and finally topped with people, vehicles, animals, etc. etc., all done in context to basically "tell a story". He once said he was useless at anything artistic and I took him into his train room and told him to take a look - then it dawned on him, just because he wasn't drawing/painting a picture didn't mean that what he was doing wasn't "art".
I started a love of art very late in life after visiting the VanGaugh museum in Amsterdam and listening to the audio guided tour which explored his early life, inspirations, challenges, etc. Prior to that, I just thought he was a nutter who chopped his ear off and drew a picture of yellow flowers. I came out, literally, a different person, after learned how he used revolutionary/exploratory techniques and materials, how artists of that era did lots of self portraits because they couldn't afford models, his inner turmoils, etc.
I can now spend hours just messing around and enjoying myself, being proud of my amateur artistic attempts, once I was free of the straight-jacket of thinking I had to draw accurate representations of what I could see, i.e. trying to replicate a picture. That's basically what I was taught at school! So wrong!