What are you guys doing with your (hobby)pictures?

I do a lot of nature photography just for fun and I am not planing on selling them. Currently I’m uploading it only on instagram. You can see they are high quality if you use the correct format. Still, I’d like to show the pictures in their full quality as well. Are there any possibilities to do so?

I though about creating a website but as far as I’ve seen it, the pictures won’t have a good quality after upload. (Why?) I also thought about printing but I can’t fit more than 5+ big pictures into my home, so that’s very limited.

Also, is it even recommended to upload pictures in full quality? What if some people use it as if it’s their own? What if I want to sell some prints in the future but the pictures are already online in full quality, can’t people just download them and go to a random print store by themselves?

TL;DR: Do you show your pictures in full quality in the internet?