I mean to say, is there any platforms or tools that can help you assess market / companies or anything similar like market sizing, peer comparisons, etc.
It is likely a series of sources. Subscribe to CB Insights email for data driven views. A full subscription is $100 K so unlikely in your budget, yet you can get tons of information from them in a free version. Crunchbase is good for company comparisons and investment data, and Statista has a huge volume of market sizing.