For Austria and Germany I would basically rule out working as a english teacher tbh - It's next to impossible.

Basically everyone goes to a state operated or recognised school - and for a job at these you will need a local education degree, superb local language skills (like: Not only speaking on the level of a natural speaker but also dialect free) and for Germany, depending on the state/in the majority of states you will also need the right citizenship.

Private language schools exist,but they are not widely used (like really really rarely) and often are staffed by teachers having a locsl degree, local education students that need some extra money,etc. There are very very few spots where someone with an non-local degree might fit in (and most ads you see for that sadly are a pyramid-like scam).

So.... Tbh, maybe consider another way of making money. (And note that self employment in Germany works totally different from the US, is highly regulated and has a LOT of hidden costs)