Long train + subdomain

What do you think about a strategy who use a main domain and each key word is generate on a subdomain
I did a test with a domain who is online since 6 months I post 200 pages but the result is under my expectation the domain is wildcard thhe content is generate with a light spin and vertical link I mean Region / departement city
All your advices and questions are welcome

This kind of setup can work, but not out of the box. Subdomains are treated like separate sites, so without links or real signals, they won’t move much. Spun content on a fresh domain usually gets ignored or buried. You’ll need authority or some kind of push to get traction.

NeedMyLink said:

This kind of setup can work, but not out of the box. Subdomains are treated like separate sites, so without links or real signals, they won’t move much. Spun content on a fresh domain usually gets ignored or buried. You’ll need authority or some kind of push to get traction.

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yes I already start to feel like that but the main point is the main domain is a classic WP site with normal articles and i start to put some back link and in some articles I share the links from subdomain for increase the internal with various anchor but yes the indexing is not easy 10 % maximum pop up with site: but when I take inside content and use with " " is almost not pop up. Just see a video guys explain french US web sites are more filtered by google because this nations are more able to black hat strat .
The fun fact the main domain pop in discover since one week with out popcash so thhis make me think somethings should me more experience