@firstname.lastname@example.org that post is day 4 of my #100DaysOfIndieWeb project which I started on January 1st:
Day 1: https://tantek.com/2023/001/t1/own-your-notes
That and subsequent days should help provide context.
For example, I noticed you have your own personal domain daviddelgado.cat, yet it seems to redirect to a Linktree. One way to make your web presence more #IndieWeb would be to use a static page served directly on your domain for that, instead of redirecting to a 3rd party service.
If you feel comfortable with HTML+CSS, you could follow the instructions at https://indieweb.org/GitHub_Pages to setup a free static GitHub page to serve at your domain, and add all the same links you have on your Linktree.