Then you should consider finding a list of strong well known nodes (explorers, miners, high speed ones) and add them to your bitcoin.conf by IP just to finish bootstrapping.
How do I find those? I tried Googling it before but most of the time it was just old info.
In my opinion, this is a major Bitcoin issue though. I do realize most users will never use Bitcoin Core but still, there if there is lack of reliable nodes, it has to cause problems. A year or so ago this was working smoothly.