Seems to me like you have three options: keep on growing bootstrapped 100%, grow to 10k-20k mrr range and find investors to help you build a team to further grow and compete, third is to close the project and find better opportunities (a talented dev like you will not have a problem finding one). All of these options have expected rewards and risks, you must weigh out these alternatives compared to what you can currently sustain.

Option 2 will require you to focus on what are the 20% of tasks you can do that will have the highest short term impact to build traction.