Products not coming up in organic search, only sponsored ads showing

My product was ranked in top 50 of the category it’s listed in. I’m usually using sponsored ads (3 out of 4 weeks) and in most of the generic search listings my product always comes up on the first page in most cases (2nd in some). I stopped advertising about a week ago, still getting sales of 5-8 units a day then noticed my sales suddenly stopped yesterday. I couldn’t find my product even though it says its BSR was 40-50 in the category, listing looks all good and active, no suppressions and my store front shows the item. I contacted seller support and they couldn’t provide me with anything other than a generic artcile how to boost your rankings, any ideas guys how to fix???