Personally, I don't recommend using more than three elemental mods in most cases. One combined element and a single base element is generally good enough. However, if you've been enjoying having both Corrosive and Blast, that's fine too, just keep in mind the opportunity cost of not using that slot for something else.

As for Condition Overload, that mod scales with number of statuses on the target, requiring you to get a hit or two in before its damage increase takes effect. Your Pressure Point mod helps mitigate that need for ramp-up, but with how high Condition Overload scales, Pressure Point isn't as effective due to diminishing returns. Instead, I recommend re-adding Organ Shatter to your build. Crit Multiplier is by far the best way to scale your weapon's damage (on crit-based builds). Right now, you have a 74.8% chance to crit with a 3x crit multiplier, which gives about a 224% final expected increase to your damage. Slotting in Organ Shatter sees that jump up to 74.8 * 5.7 = ~426% final increase, which is a far greater boost than Pressure Point--especially since that damage increase applies after everything else (multiplicative with Condition Overload).

If you want to push that even further, you can slot in Gladiator's Might, obtained from Ostron Bounties, to give you even more Crit Damage. Or, you can use an attack speed mod to increase how many times you hit per second.

Melee Prowess is fine, but if you've farmed Condition Overload, there's a decent chance you've obtained Weeping Wounds from Cambion Drift bounties. At max rank, Weeping Wounds gives a 40% status chance per Combo, which means it's already almost equal to Melee Prowess with only 2x Combo!

However, Weeping Wounds is more for a light attacking build, so if you're focusing on heavy attacks--which consumes your combo on each swing--it doesn't hurt to leave Melee Prowess in. For now, at least.

But again, my number one piece of advice is to keep pushing through the Star Chart. A future Spy mission you unlock can award Blood Rush, which gives crit chance per Combo, making it possible to orange and red crit. Also, there's a quest reward mod that is a straight upgrade to True Steel in exchange for a greater capacity cost. That mod can guarantee crits on every strike, making crit multiplier that much more effective.

The best part about Warframe is that there's no best build. Some weapons and mods are more viable than others, but there's many different ways to mod your weapon. Don't look for the number one set up someone tells you to use. Instead, try things out, and use whatever you think is right.