Active privacy is a journey. You can run through all the tutorials and technology recommendations that others have posted, but you will find the best progress by taking things incrementally.
One good place to start on a new path toward personal privacy is The New Oil. This is an excellent website that lays out important privacy-enhancing steps.
You can also reference Privacy Guides for recommended tools.
From there, it will seem like a mountain of things need to be done. Sometimes the necessary steps will fatigue you. But keep picking at it, piece by piece. Do not get discouraged, you will be better off than you were when you started.
A good deal of discipline and self-denial will have to occur, especially if you wish to wean yourself off surveilling Big Tech. Things like deleting Facebook, Instagram, Snapchat, Tiktok, other social media, Google, and Apple are very difficult in today’s life. But these companies siphon data daily from you and are a path to privacy invasions by other entities.
Take heart, it is a good journey that I believe will win in the long term.