If you're in the finance niche, try GOLD IRA affiliate programs.
FAT percentages.
There are many ways to play this niche: finance news rewrites, retirement finance niche, personal finance, etc.
You don't even have to start from scratch
Just find your competitors
Run their domains through AHREFS/SEMRUSH etc
Find lower difficulty kws
Load the kws and spot weak results
Create
SKYSCRAPER CONTENT
Optimize with SurferSEO or frase
Do blog collabs for baclklinks
Do guest posts for backlinks
Move on to a similar niche and repeat the steps above