The key to any successful sale is to have competition, i. e. other possible buyers - in the absence of that, you need anotehr strong strong BATNA - in your case

The key to any successful sale is to have competition, i. e. other possible buyers - in the absence of that, you need anotehr strong strong BATNA - in your case that may well be to just keep running the business! Given your ARR it may make sense to get an M&A adviser involved who will be able to solicit more offers. Their fees are high but the cake will be proportionally bigger, and you will likely avoid making costly mistakes! You could also check out microacquire.com - though it seems that your business may be too big for them.