I need advice on if I should sell my site builder, which supports 11K businesses (big names want it)

My company, Original, builds products.
One of them is a site builder called Pop Site (www.pop.site)
What started as a small, fun project, has grown into supporting 11K businesses.
We've only just recently started monetizing via micro transactions, but even with that we blew past $1K MRR quick.
We have major players, I won't say who out of respect, but more than 1 of the "biggest" site builder's CEOs talking to us about acquisition (all are names you'd know).

Would you even consider selling at this stage, should we raise and "maybe" blow it out the water? How rare is it to break into a space like website building, scale fast and actually get MRR going?

I don't want to over or under value what we've built, and would love opinions from those that have exited companies in the past.