There are still places that need and are looking for that sort of help! Especially inside smaller cloud companies (Digital Ocean, Linode, etc) (or any company that's got their own datacenters, eg Facebook) where the solution to a problem can't be to use some AWS service. A heavy hitting sysadmin (embrace calling it devops instead) like yourself is necessary to getting stuff off the ground to a proof of concept stage, then to production.
Grinding leetcode is falling out of fashion anyway for many reasons, (but Leetcode will never tell you that), but it's still a skill to practice up on and be able to make it past an easy question without problem. It's not a skill you'll use normally at work, but the secret is no one's good at leetcode shit out of the door. It takes dedicated practice until you can pass it the interviews, just like any new skill.
Grinding leetcode is falling out of fashion anyway for many reasons, (but Leetcode will never tell you that), but it's still a skill to practice up on and be able to make it past an easy question without problem. It's not a skill you'll use normally at work, but the secret is no one's good at leetcode shit out of the door. It takes dedicated practice until you can pass it the interviews, just like any new skill.