Assuming Trump were to get elected in November, what individual stocks, sectors, or 401k/mutual funds could see the biggest jump?

I would imagine DJT is going to eventually become an option on Trump being elected or not. As far as long term viability of the company - I'm not so sure it's where I would want my money to be invested. But it would hardly be the first meme stock to take off for reasons unrelated to fundamentals. It's obviously not a coincidence that the ticker is his initials.

Other than that - I'm very bullish on the energy sector regardless of who the next president is. A republican presidency could certainly unleash it a little quicker, but a worldwide energy crisis is looming and there will be no "ending fossil fuels" in our lifetime.

The natural gas industry in particular could see a bump if Trump is able to free up some of the mess with LNG exporting that Biden has created.

Offshore Drilling too could see a bump if Trump really goes down the "drill baby drill" route. Capacity has to come from somewhere...

Trump will be able to sell his shares by the time the election rolls around, and the extra small float that is propping it up will no longer exist.

Unless we increase refinery capacity, the volume of oil/gas pumped out of the ground won't matter. In fact, refinery capacity is a larger problem right now.