Here's a list to get you started: https://medium.com/@cointastical/freelancing-platforms-which-pay-in-bitcoin-e38be56166df

I've not used any of the sites listed there, so I can't vouch at all for any of their reliability or trustworthiness. Make sure you spend some time to fully investigate and vouch the site before you hand over personal details. Also be aware that the market is very saturated with people who want to earn bitcoin from home. Not only may you struggle to find offers, but as I said before, your pay rate is likely to be less than what you could earn from buying bitcoin with fiat earned at a "normal" job.