Since there's a different way for people to follow you, using other social media sites or forum boards can slowly build passive follow streams.
I've personally evaded certain websites after learning how policy is against market scale, but whitehat may still produce if playing by the rules.
To ensure longevity or avoid bans promote using hashtags or other @ALIAS_IG instead of watermarking URL's.
Growing SNAP has to come from real people who find the user profile, there aren't too many internal uses to grow and outside work makes this network as powerful as advertised. Compounding follow value does better if at established communities always seeing what to type in.