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There's https://sopuli.xyz/ which is run by a Finn, I'm sure you'd be welcome there.
Post links of your self-hosted instances of Lemmy!
I sendt you a private message about it, hoping that it comes trough!
I mean - start small, open up a !Scandinavia Community and grow it. You can probably exclude foreigners by using your languages to an extent (much like there's both !Germany and ! Deutschland for example) and if you have enough interest, build an instance.
If you know your way around computers, renting a server and then deploying Lemmy via docker is fairly easy. You'll have to front the costs though.