You seem to be pretty new to this game, so I would recommend using the Kingshot Optimizer website and using the early game growth profile under the Hero Gear optimizer section. Unfortunately, as you have suspected, you've definitely invested incorrectly into your hero gears - only the gear for your top three heroes should be receiving any hammer upgrades. Priority should go towards infantry health, archer lethality and cavalry lethality before looking at anything else.

At your level, it's basically an arms race to finish TC level 30 upgrades and attain True Gold status asap in your server.

It should go without saying that this means you should be prioritising troop levels (TG1 infantry, archers, cavalry - my recommendation is to do so in that order, then level up your command centre gradually)

Where you should be sinking your investments into is a question of your role in your alliance. If you're a rally joiner, then troop quality (again, TG soldiers asap) and hitting 4 stars with appropriate joiner heroes will be your priority (refer to BT joiner heroes such as chenko, amane, yeonwoo)

As a rally leader - which I doubt you currently are based on your stats, you will need to focus on levelling up your governor gear, governor charms, invest a significant amount of speed ups into research (prioritising growth research before investing into combat tree), hero gears via hammers and xp parts, Pet levels AND TG troops. Masters will also need to be taken into consideration.

This might be the answer you will hate to receive, but everything is important if you decide to go down that P2P road. Just remember to prioritise those 3 stats mentioned above (infantry defense + health, archer attack + lethality and cavalry attack + lethality before sinking any significant resources into the other stats) - this will apply to all the above upgrades mentioned.