Video is your friend
Focus on video.Video performs better than photos, on all social platforms, as it is more engaging, grabs people's attention faster than a photo, is more memorable, and statistically drives more traffic. You must get better at it, and the only way to get better at something is to do it. You know how you can't get better at push-ups by reading about them, you have to do them? Same thing with video.
Think of it this way, again, as a creative you have a massive advantage with content. You have a tangible real beautiful thing (painting, drawing, sculpture, craft) right in front of you that deserves to be out in the world. Remember that art is subjective, there are always going to be people who love, or hate, or like, or dislike, or are indifferent to your art, so you may as well give value and share it. You don't have to talk or posture and feel uncomfortable. Take videos of your art itself, you don't have to be in the video!
Take a short 10 second video panning around your art, zooming out at the end. Take a time lapse video. Buy a little phone tripod online, there are tons of options. Take a WIP video (work in progress) Google "How to make art videos". Watch other artist's videos. Practice taking your own, upload, repeat.
I use the Adobe Rush app, it is a paid app, however there are many other free apps out there such as imovie, that will allow you to edit video. I stitch together little segments to make longer videos showing my art process. But just start with taking a ten second movie on your phone and posting it, don't worry about adding music, or just play music in the background on a stereo while you are filming.
Once you're a little more comfortable with this, move on to #3.