NoFollow links are normal and have been proven to be healthy when it comes to ranking on Google. In fact, if you have an unhealthy ratio of DoFollow vs NoFollow links to your site, it could raise red flags for SEO.
As the NoFollow attribute was introduced in 2005, the entire web slowly began to switch to NoFollow because of fear that they would be penalized by Google if their user-generated content was linking to spam sites. That entirely defeated the purpose of introducing NoFollow in the first place, and because of that Google has recently introduced and has been pushing the use of "sponsored" and "ugc" tags.
In a case study by SemRush, it was noted that for the #1 ranking pages on Google, around 20%-40% of their links were NoFollow. In fact, the percentage of NoFollow links for the #1 ranking page was higher than the percentage of NoFollow links for the entire site.
To sum it up, NoFollow links are good for your site and you should continue building links on quality sites, with a bit less regard to whether they are DoFollow or NoFollow.
Daniel Rika - Dalerio Consulting
https://dalerioconsulting.com/
info@dalerioconsulting.com