Trying a thing, and realizing it doesn't work, isn't a sin.
Working on a thing for a while, and never finishing it? Also not a sin.
Working on 5 things at once, and only occasionally making visible progress? It's fine.
If folks tell you that you're spread too thin or doing too much or whatever, they're probably wrong.
They don't know you.
If you tell them you're spread too thin, that's another story! Listen to yourself, trust yourself, be kind to yourself, and block everyone who tries to discourage you.