I largely create my own tools now, but I made the exact transition you are making a number of years ago. I took it as an opportunity to reinvent how I conduct SEO and it was a real growth moment not just for the free clicks but for me as a person doing SEO.
My advice... before you get into tools re-evaluate the problem you actually want to solve. Do a few iterations by hand so you understand the problem and its challenges very well. Once you find success doing it by hand then look for tools or ways to automate or scale your successes.
I spent a lot of time drooling over keyword reports and rankings data, but when I really scrutinized what I had done later I found I spent a lot of time on things that wont make money and neglected tons of easy wins that do.
Tools are tools... knowing the business, knowing the customer, and knowing SEO do not manifest from the tools. You might not even need the tools. For example.... used to check rankings daily... now I only check them if SEO revenue falls which is maybe once or twice a year. The value of a rank checker has been significantly demoted in my routine. My employer doesn't need to pay for all that daily rank checking. I freed up time to work on things that helped SEO revenue.
