Sell stocks purchased in pandemic or keep for dividends

I invested heavily into $MPC and a few others when it crashed to $30 / share in 2020. It has recovered and I am up almost 300%. I sold my cost basis when it reached long status so it is pure profit at this point.

It is currently returning 10% year in dividends on my cost basis. I expect it to be pretty stable and am neither bullish or bearish on the stock at this point.

Should I sell and diversify into other industries or keep the dividend cash cow?