I've done the expat/migration thing myself, there are some upsides for sure, but it can also be quite draining being a bit of a social misfit, not having a much of network/connections, dealing with the linguistic/cultural/administrative issues of visas, etc... in many ways you're just forever at a disadvantage to the locals.
I also don't see Portugal as being a big step up from Turkey in the grand scheme of things. Both basically europe, mediterranean, decent standard of living but kind of second-tier economy, etc. If anything, Turkey is obviously bigger, has some bigger cities, more of a range of lifestyles, etc.
I think migration/expat life can be worth it if you're moving to silicon valley, tokyo, new york, shanghai... or somewhere that is a centre of gravity for your industry (like australia for mining, texas for oil, shenzhen for hardware manufacturing, etc...), and the income/growth potential is many multiples of what you can get at home, but I wouldn't be doing it for a modest, largely sideways move.
As for your 10k EUR... obviously, beware the sunk cost fallacy. Also, these things aren't permanent, if you want you can do it for 6 months or a year, see how it is, if it's great, stay, if it's not... go back (or somewhere else).