Welcome. I look forward to reading your posts.
I have found that participating in challenges a great way to improve my writing. It will also help with initial engagement and meeting people. Starting off can be hard and a little disappointing, when you post and the response doesn't seem to match your efforts. Weekly challenges can help with this too.

Freewrite hosted by @mariannewest is great 5 minute writing practice
Micro fiction @jayna
zap fiction @felt.buzz
pun writing @improv
Other weekly themes that can help with posting and engagement.
If you stitch, needleworkmonday
Mountain Monday
treetuesday
wednesdaywalk
Marketfriday
Black and white photography @davaks
Daily # colorhallenge. Monday red, Tuesday orange etc.
Feathered Friday
Caturday
dailypetphotography
There are many. I find once I discover one and check out their content, it leads me to the next.