Most time after I build PBN backlinks the websites are going from #10-30 to 50-nowhere within a few days after I stop building these PBN links and stay there for at least one month. This happens to websites I am building on expired domains. This happens only since this year, in the past I never had any problems with making PBN links. It is clear that Google sends my websites in this kinda "Sandbox" or give it a "Algo Penalty". How can I get out of this? Some people wrote adding content and sending social signals. I did both of it, but no increasing. All my content is unique. Also how to not get into this Algo Penalty/Sandbox in the first place? I tried to take it very slow with making backlinks (2 PBN links per week with only URL and branded anchors), but still the site is sent from 20 to 60/nowhere. I would really appreciate your help guys.