Your No Mod top plays is just around low 4*. You will have a long way to go to be able to FC anything above your current capabilities. And for those 4*s, you can definitely do better with higher accuracy
There's generally two ways to progress your skill. These go both hand in hand
• Pushing you absolute limit with what you can pass. Some might prefer to just bypass this by playing with No Fail but I recommend you at least try to push the highest star rating you can do without No Fail. This kind of progress is relatively straightforward by forcing you into new things you previously don't know about before
• Getting better acc and eventually, more combo until it's a full combo on easier difficulty that you can do. Besides pp and rank, this ensure your consistency is polished and able to play with a bit of effortlessness. You'll minimize basic mistakes, naturally aim and tap, all with little to no mental and physical burden as you also learning more difficult stuff