Obviously right now is probably ill advised as various countries in Europe are dealing with the pandemic differently and vaccination might become a factor at some point down the road.
Find out which European country you want to live in, it's a wide ensemble of laws, culture and practices and simply "moving to Europe" will vary a lot depending on which country you move to.
Language is probably on top of the list, I know in some countries just speaking English will be ok and companies won't care, but you will want to do some research on that (i.e. I lived in Germany for a short time and I'm glad I knew enough German to get around).
As far as software development goes, there isn't a shortage of companies hiring, you might even be lucky enough to find a company that is willing to sponsor your.
Check your own countries rules re earning money in another country, they might want to tax you.
Overall I'd say you need to research:
- Which country do you want to go to
- What are their immigration requirements (not all of Europe has the same immigration rules, despite what anti EU idiots think)
- Daily language use
- How much does it cost to rent a place
- How much does it cost to live there (food prices vary a lot)
- Right now this is a terrible idea, but go to the country and stay in the city you think you want to live in and test it out, this isn't a substitution for actually living there, but is a start to find out if you hate it or not
In ref to buying a passport, yes this is an option, some countries still do it, usually quite expensive.