I think you will do well joining in with the Open mic community here.

The community can be found here....
/trending/hive-105786

Basically how it works is the new theme is announced every Sunday by @hiveopenmic

The current theme is "A Better World For All" this theme started this Sunday the 7th and ends on the 14 when the new theme of "Moonshine" begins.

You have a whole week to join in for each theme .I would say it is best to upload your video on Threespeak as they are pretty supportive of us open mic artists and will usually upvote your song.

The main thing is remembering to say the week you are playing for at the start of the video so if your recording this week just mention it is for week 123.

When you upload your video on 3speak select the open mic community and when the post is complete drop a link to your entry in the current weeks post which you can find here.
@hiveopenmic/hive-open-mic-123-worldwide-live-music-event

That post above contains everything you need to know to take part maybe just have a read of that and you should be good to go.

I look forward to seeing your first open mic post :).