Depends on how old you are. Making friends take two to tango. If the other person doesn’t seem keen it might not be personal. They might just not be in that frame of mind.

Can’t say for yourself. If I was single and childless. I have a remote job so don’t see anyone. But I would start going to company social events. I would pick a social sport so there’s the added bonus of exercise. Wild one but perhaps getting a weekend job. If it’s somewhere chilled with likeminded staff and hobbies. If it doesn’t work you made money and get a dose of socialising if it’s people facing.

I’m thinking book store, music shop or even charity/festival volunteering