Transitioning to CRM from generalist marketing role?

I'm late(ish!) 30s and have worked in digital marketing for my entire career. Quite generalist. Currently focusing on projects and processes in my current mid-level role. I want to transition into CRM as I think it plays to my strengths and interests.

From my perspective, I have transferable skills: project management, overall marketing knowledge, strategy, analytical skills (could be developed though!), process improvements, managing PM software, collaborating between departments. But I obviously have gaps: I haven't really been involved in CRM work for years. Did a little bit here and there throughout my career, but in no real meaningful way – creating some very basic email journeys.

I'm wondering whether anyone else has taken a similar path and can share any advice?

Some specific questions:

• Where do I start?! 🙂
• What CRM system would be advisable to learn? SalesForce, Marketo, HubSpot, Dynamics, other?
• I'm late 30s with mortgage, wife, and kids – am I going to have to start from the bottom and work up? If so, will my progression be speedier due to prior experience? Don't mind taking a hit on salary initially, but would be good to hear that I won't be starting literally from square one again with another 10 years to get the same salary!!
• Is there a course I can take that would plug what I see as my gaps?… Specific CRM system training, customer data management, CRM strategy.
• What are the prospects for the future? Is it even a good idea to pivot into CRM?
• What other roles / paths can I take in in the future?

Appreciate any help you may be able to offer 🙂