This is a really complicated topic but as with all things, habit is definitely key. I recently discovered https://www.enki.com/ and absolutely love it for this.
In addition to that: imposter syndrome can get in the way of writing code. There's lots to be said about getting over imposter syndrome, but it's not that easy. If this is something that affects you, I can highly recommend a psuedonym to help you interact in IRC and other feedback channels.
The link you yourself share features many comments, including by GitHub themselves, that this wasn't a new limit. They publicised the change earlier in the year.
This has been around for a long time (see other answers in this thread), so if you've seen any site handle the Reddit hug in the last year, no reason anything should change.
This has been around for a long time (see other answers in this thread), so if you've seen any site handle the Reddit hug in the last year, no reason anything should change.