CPA 1 Niche 2 Domain

Ok guys I have a question

I have 2 website same niche, one is legit site no cpa offers or ads just pure content, i been getting traffic from google and it has been in the increase for some time now, $0 a month

My other site gets 0 google traffic i have cpa offers on it, all traffic in manual from youtube( i have to upload vids all the time)$200 to $400 a month

I was wondering if I should combine them too or keep separated?
If i add cpa will my viewers decease? Will google ranking be affected?

you can use website A (the one with content) to boost website B (by linking) it might boost rankings for website B.

website B would be hard to boost, i been using it for 5 years mostly for testing stuff out and it has had way too many niches on it to be able to rank, its an abused domain

Would it be better if i get a new domain and then link it?

yeah you can get a new domain or you can always monetize website A, my CPA sites have good amount of content lets say for every niche i post atleast 3 500+ word articles and then interlink them and i have around 50+ niches so that 150 articles in total.

Combine them you will get better conversions + stable income.