After any good idea's discovery (nontrivial if its novel) and motivation, 50% of the active effort is moving the idea from a vague concept to something highly specific that can be implemented. The remaining 50% is implementing the idea.

If you can't implement an idea yet want to maximally participate in generating something new, do the 50% of the work that doesn't require implementation. Specify in detail how something should work with allowance for your ignorance of its implementation.

You will be bad at providing detail at first, and your failure will hurt, but you'll get better at it like anything else assuming you don't give up trying.