I started with blogger for the first 6-7 months and then converted to WP (which was a giant pain in the ass, even when using a free service to handle it for me). After the conversion, my (meager) traffic doubled.
My site is still less than a year old and I'm working my way towards 100 articles (getting close!), so I can't say that the Blogger to WP conversion was the reason for the jump..could just be the whole sandbox thing. But, I did see a big uptick with WP over Blogger. I also think it's because I now have the ability to use plugins like Rankmath that help keep me on track when I'm writing.
If you do decide to do Blogger, pony up the $12 and buy a domain.