Hello, Id be happy to help assist you In understanding your dreams. With your first dream I believe it was the influence of the TV series Stranger Things. For example my husband too had a very odd dream right after watching the finale episode of that show. If we watch certain things that have a major impact on us. It will result within a dream.
It can also show you are starting to be come "aware" of things spiritually taking place or that are hidden. Such as the dreams of you holding fish can be showing that you are "fishing" for new thoughts or beliefs. You are digging deeper into the spiritual state of things. Key chain can be showing the "keys" you are needing to find the questions that are arising in your current thoughts and state of mind. The key is right there waiting for you. Almost as a door is being open for you to search deeper into what is actually taking place in this world.