Reddit is not stupid. It is easy to spot spam patterns especially as they bring on more AI/machine learning/pattern recognition. Don't be the tallest blade of grass in other words make your account behave like a typical Reddit user and don't deviate from the baseline.
A typical Reddit user doesn't do a 100 link drops in a day especially on their first day. Start slow. Age the accounts. Do normal activities like viewing threads & only upvote a few of them. When it comes to commenting don't drop a link in every comment. Go at a slow pace per account. When using multiple accounts don't have them upvote the same 20 threads, that is easy pattern for AI to spot.
Reddit looks at IPs/proxies and knows when one of them is a flagged for higher spam than the baseline & will ban all accounts on that IP if it gets too high. Reddit keeps track of browser fingerprints so they can ban any future accounts you make. Reddit pays attention to domains and how often they are flagged as spam.
What worked last year doesn't work today. What works today might not work next month.