Do you have product market fit, and just need to do more marketing? If so, I would keep going. Otherwise, I'd probably be a bit burnt out after 3 years of no PMF.
I doubt if "bootstrap" is the right way for this type of product/market.
The famous PMF survey (how do you feel if you can no longer use this), %50.8 responds with "very disappointed". And I deeply know this product is pretty unique offering in "finance tracking" market.
But the MRR stays in this level for 6 months now. I feel I do not have ideas to break it through.
And then from there, figuring out what the rest of the market is using, and why.