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As I'm planning to update the products and want to rank better I was wondering if that is spammy or ok to do for SEO? Lets say I have ~25-35 keywords that I want to use in product SEO title, SEO meta desc. and image alt Text. Would it be considered spam if I do it like that for 20k items...

I wanted to ask if this is normal ? It's a shop with over 20k products and new items are being added every ~2 weeks so the number of links indexed should increase instead of steady decline? What could be the cause?

I have a question regards to product SEO. If I have 20k products and I use same keywords, SEO title, meta description to a lot of the items will it be considered as spam by google?