I have been running my business for a while now and I have some capital to reinvest into leveling up. Where can I find Mentors, coaches , advisors to pay who are ahead of me or have information.

I am in agency business but I also want to find mentors/coaches/advisors for lets say: software, SAAS and e-commerce.

where can I find targeted people who are ahead of me in different business models or niches ?