Sounds like a very common newbro impression of what Exploration is.
Are you running primarily Relic sites or Data sites? Because Relic sites are reliably better ISK than Data sites. They can be very lucrative in certain regions like Esoteria, Paragon Soul, Period Basis, and Delve, where you have a chance to find Intact Armor Plates worth ~7m a pop.
I’m sorry to hear that you’re disappointed by this part of the game, but that just means more loot left for the rest of us.
This part is very wrong though. First off, Trade skills have near negligible impact on the prices you get since the market is determined by the players. Second, you’re likely just impatient and selling them to underpriced Buy Orders instead of listing them up as Sell Orders. The old adage of “Buy low, Sell high” is well and healthy on the market, so there are plenty of people looking to buy your goods for low prices if you’re impatient and just sell to those orders.
Good luck with the rest of your EVE Career.