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Yes, but you may need to reframe the idea a little bit. The concept your missing is "delegation." You can have other accounts delegate Steem Power to your upvote bot which will increase its upvote value. You can see in my wallet that I have delegated almost all of my steem power to @artturtle. Others have delegated to @artturle as well. The upvote bot can be made to upvote only those posts that contain a specific tag like "sustainable". Making one of these bots is not easy. But there's a service called steemfollower or something like that and it will set up a rudimentary automation for your account. Not sure if it upvotes based on tags though.