Hi, the answer is a resounding "Yes!", Email marketing is still a highly effective way to reach your target audience and drive conversions. Of course, like any marketing strategy, it requires some planning and effort to make it successful.
As for a good niche for email marketing, that really depends on your specific business or brand. However, some popular niches for email marketing include e-commerce, digital products, health and wellness, and personal development.
As for where you can find emails, I guess you can do a lot of promotions and do some social media marketing. And then send bulk emails to them. I used BlackBulkMail for my bulk email sending these days.