Hubspot, Salesforce, Monday are all good options. I would say Salesforce is the most comprehensive however its a big set-up Monday and Hubspot are easy to set up. I have self-hosted with Suite CRM as its open source and open project for project management.

The real questions are where are your audience online, which platforms are they using, what type of content do they engage with and what is my ad budget. Once you have researched that you can narrow it down to the ad platforms that work for your business and your users. Finally you can begin working out ad strategies that would give you the best return on investment for your given budget and chosen platform.