Country? Culture will have an impact here.

Honestly it sounds like you are abdicating yourself of responsibility, To be blunt Have you asked for more work?

Especially in the current situation with COVID it could be that you are simply not his top priority, maybe he assumes you have work to do and is focusing on others.

So recommendations.

- Talk to him, do not mention 'being ignored' simply tell him you're interested in the current projects and would like to be involved.

- If he is hostile/unhelpful during the conversation and decides to continue not providing work, start exploring new job options.