If you’re logged in to lemmy.world, I think you can click the hamburger menu top right and then “Create community”?

Edit: sorry, just noticed your account is on programming.dev, where there’s no such option? Then I’m afraid I don’t know :/

Edit 2: From the programming.dev sidebar:

Community Creation

Communities in our instance are created from our community request zone. If you have an idea for a community that fits our instance that hasnt been made already feel free to create a post for it there. Communities will be considered for creation if theres enough interest in the idea shown by people upvoting it

Lemmy instances can enable an option to prevent non-admins from creating communities, so if it isn’t available on your instance (usually in the header area on the website) then your instance admins have disabled that option

In programming.dev we have a community request zone at [email protected]

You can find info like this in the sidebar if youre on web (and there’s going to be a support site made soon)