What kind of skills do you have?
Many discussions on this Forum are low-level, for example: changes to how the virtual machine functions, or how state data is stored. However, some proposals and discussions would have UI / UX implications, and might benefit from design brainstorming and prototyping.
For example, this ERC-3450 proposal by @dstreit; this is cryptography-related, but has UI implications because it helps users secure their funds from key loss. Maybe the proposal could use some UI mockups or a demo.
To get into the weeds: ERC-3450 is a standard way to split a BIP39 mnemonic / word phrase into another set of mnemonics which can then be distributed to other parties for safe-keeping. Later, a predetermined number of them could be brought together to reproduce the original BIP39 mnemonic / word phrase. Check out the JS module implementation: danielstreit/shamir-bip39