Welcome.
You can probably buff the tank and get some really great results. The black side panels (if yours have them) are single stage and don't have clear over them, only the colored top, so be mindful. I have used a clay bar first to deeply clean the paint and clear, then actually wet sanded the entire tank very gently with 1500 grit, then 2500 grit. Then followed with a quality buffing compound on an DA buffer and foam pad. Came out rather nicely.