Skill is a plus to get crypto but even if you don't have those skills you can still earn bitcoin on some other jobs here. There are running campaigns available around also there are clients who hire social media managers and doing some small task like joining to be a beta tester or even joining or participating on airdrop events.
With or without a skill you can still get a cypto. Say I am not skilful but I have a cash on my pocket, I can just use this cash to get a cypto for my self but to expect a return is likely impossible if you do not have a skill and knowledge related to crypto. We need to obtain that two first if our goal in crypto is to earn.
I think doing a crypto job will also require a skill and knowledge but jobs that are not related to does not really. Anyway the op is not looking for a job to earn a crypto but he already have a capital and he prefers to earn a stable income per month but that looks hard to achieve if he will do trading or investing since cryptos are very volatile but he can try staking because there staking platforms that offers fixed returns.