Multi-lingual SEO problem!

Multi-lingual SEO problem!

I want to switch from system (no Wordpress anymore) or wordpress theme/plugin because i face issues with the UI/UX. I run a multi-lingual classifieds website with mainly organic visitors.

To have a background about my website: My website is about a specific type of truck that is being bought and sold over the whole world and is also transported. So people from the USA want to see also the German ads… But I want to give the German people the best time on the website to let them upload on the german version.

My website is available in English (.com), German (.com/de/) and Dutch (.com/nl/) and i have listings based on mostly custom fields where people check boxes, use dropdowns, short text fields (ie motor type:), etc… And the only long text is the title and description > Then the ads will be visible in all the languages once you upload it once to one language only (for instance on the german version).

On my current wordpress website, this is not the case… Here i face the problem that when a person uploads the ad on the german or dutch version of the site, the listing will only be visible on the german or dutch version…

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So I already have been looking at different CMS compared to Wordpress. I am looking at software that is build to function as a classifieds system. Now Osclass came along...

Normally when creating a multi-lingual website different slugs are created. For the normal website (e.g. english) .com is used. But for german .com/de/ will be used and for Dutch .com/nl/.

This gives a lot of SEO value as wel.

My current classifieds website (wordpress) contains over this future. But as mentioned... It has a sh*t UI/UX... Osclass is translatable BUT it doesn't give you an extra slug/language domain (ie .com/de/)...

Will this affect my search position for the german visitors or dutch speaking visitors?

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What do you recommend? Switch to Osclas/Stay with wordpress but another Theme/Plugin Or Go for something completely different....

Please inform me when my case is unclear but i am looking for a solution!