Any advice to introverts on how to come off as more approachable?

How can introverts come off as more approachable and friendly? Most introverts I know look typically pretty closed off and intimidating whether it be at random social gatherings or just on the street.

All tips and advice are more than welcome from just about anyone who knows how to look friendly and open!

Updates
11 mo
Thank you everyone for your tips and tricks, I've been trying to have a small smile on my face instead of my usual rbf and even that has made people approach me and interact with me.
And I also tried to have a small talk with a stranger, I didn't know how to approach so I just said to this lady who was gardening that her flowers are pretty and she got all smiley and we talked about her flowers for a good 15 minutes
Y'all are honestly awesome, so small but useful tips, thanksssss :D
Any advice to introverts on how to come off as more approachable?
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