I assume you live in Germany (judging from the fact, that you use MediaMarkt).

The main thing, I would reccomend you to do is instead of searching for stuff on Amazon directly, search for it on price comparison websites. I typically like to use geizhals.de, but idealo.de is also fine.

You will probably be surprised to notice, but most things (especially more expensive things) are cheaper or at least price comparable on these websites. And the websites, that are indexed there, are typically trusted and won't dropship or scam. But just to make sure, I typically look up new websites, I haven't ordered from before up on trustpilot.com. But over time, you will probably build up a repotoire of places to look for specific stuff.

If I really can't find find something suitable outside of amazon (which typically happens when I buy some general cheap stuff), I typically look it up either with an internet search to find a more niche shop or as a last resort on eBay, because a lot of the stuff from amazon third party sellers is often up on there as well and I think, they are still better than amazon.

You don't have to go "cold turkey" from day one, but just keep it in mind every time you buy something, look if you can get it somewhere cheaper or for a comparable price and ask yourself "Is the moral cost for buying this on amazon higher than the extra monetary cost for ordering it somewhere else?". And if your answer is sometimes no, that's also fine, the point is to get out of the " amazon-mindset".

Just to give you an example, you mentioned an ESP-32 module (which I also happened to shop for a few weeks ago) and I ordered it from reichelt.de for 3,50€ a piece (9,45€ with shipping cost). The same module isn't even sold on amazon, but the cheapest comparable no-name module is sold on amazon for 3,64€ (8,64€ including shipping. So I guess you would pay less than one euro extra for not ordering from there and then you can decide, if that's worth it for you. For me it was.

Using this strategy, I haven't ordered a single thing from amazon in 2 years, so it's definetly possible and it isn't significanttly more expensive (even cheaper in a lot of cases). It also get's easier over time, as I mentioned. If you want my personal list of good websites, I like to order from, feel free to ask.

And good luck, the world without amazon is a nice one ;)

In Belgium, Netherlands and Luxembourg, you have an alternative called Bol.com.

Fast and cheap deliveries for all kinds of products.

Never used Amazon in my life and I never will.