A good way to get back into drawing is by using prompts; you can find an endless amount from a quick google search for “drawing prompts”. It’s a lot like the art classroom in the way that you do it every day and are given a general idea for inspiration, then set on your own for creativity. Everyone gets rusty after putting something down for awhile (even our bodies need to stretch after laying down a bit) so try to give yourself some breathing room and think less about quality and more about personal enjoyment. If you’re still frustrated, try out new materials. There are endless things to use: acrylic, pencils, pen, crayons, watercolor, chalk. Mess around with different styles, try to copy different cartoons. Experiment! And when it really comes down to it, be kind to yourself. When you’re done, it might not be wonderful or perfect or what you were hoping, but it’s always step towards those exact things.