Why is my site still not indexed in google?

Hi everyone I hope you can help me. I have an old site. It was well optimized for SEO but a while ago I left it because of other projects. and I ended up losing my SEO and my site god de-indexed.
Now I have setup google search console and did all properly but it has been already a week and the site is still not indexed in google.
I mean usually it gets indexed in 1 day even for a brand new site.
Any ideas will be much appreciated.
Thank you in advance