Interaction
None of this is expert advice. It's what people worked out for themselves, usually the hard way — what actually helped, and what they'd tell someone standing where you are. Take what fits and leave the rest.
Participate in group hobbies outside your home to gradually expand your social circle.
Group activities are often the best way to begin building a social network.
3 people, independently
Direct your attention to understanding the other person instead of tracking your own mental state or guessing what they wish to hear.
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Practice facial expressions and smile to appear approachable.
It improves your approachability factor.
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Join Meetup groups that suit your interests to find fun experiences and people.
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Focus on enjoying yourself and connecting with people instead of trying to prove anything or show off.
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Take up casual conversation with strangers by complimenting their dog or clothing.
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Look into reading 'How To Talk To Anybody', as it was recommended for your specific circumstances.
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Practice being friendly and interactive in automatic interactions with service workers like cashiers and servers.
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