There are many platforms where we can put your links. But the question is which type of it are more valuable? Does forum profile backlinks works well for SEO or just waste of time.
My opinion and Experience for profile link building–
1) It always good thing if it’s WHITE HAT and related to your industry.
2) Avoid too many it (at least in short period)
3) Always get it from niche specific sites and be sure about quality like Page Authority, Domain Authority & Page Rank etc.
4) Try to avoid automated software especially for it.
5) I prefer to use tools for Social Media marketing, ranking checker, ranking position, traffic updates, SEO suggestion etc. but never use for it.
6) Content is KING So, always use content for marketing as well as update to sites.