Comment by MandieD

At the very least, live like a prudent low-middle-income earner in your country, not like a Bay Area SWE.

Get used to using public transit, if it’s at all an option for you. Going down to being a one-car household instead of two saves us at least 5k EUR per year, even counting the additional cost of two unlimited local transit passes.

Avoid habit-forming conveniences like restaurant delivery, and instead learn how to grocery shop with a list and to cook things you like to eat. If you’re really pressed for time, order your groceries online and pick them up, or get them delivered (that’s an easier thing to back away from if money gets tight than restaurant delivery).

Develop non-consumerist hobbies, where you can get a lot of enjoyment out of little marginal expenditure. I’m partial to fiber arts (free/cheap sheep fleeces I clean with dish soap, then spin and crochet/knit), but there are plenty of relaxing ways to spend time that don’t involve spending much money or being convinced to spend money (like most media consumption - everyone is susceptible to advertising, to some extent)