Choose your social media depending on what format of art and targeted audiences. It is important to build a following on Instagram for instance. I myself go to Instagram before I even check out an artist's website.
Certain platforms, such as Etsy and Firstdibs, may become relevant as your business grows; however, do have a professional website where business partners can find samples of your work, media/press mentions, mission statement and business contact information. Make sure your site is optimized on Google and other major search engines so that it's on the 1st page of search results. Getting your art tagged and shared by friends and clients with lots of following is another way of increasing your reach. Lastly, short video contents are very effective at keeping your audience or potential clients engaged.
Good luck and stay well,
Definitely look for local or community events. Display work at local cafes, flea markets, etc.