@chunhe889 This is definitely a pain point for many devs & ops teams, esp. those who find starting with one of the big 3 cloud providers cost prohibitive (teams that opt instead for DigitalOcean, Vultr, Linode, and the like).
This issue comes up regularly on various subreddits. You should also check out forums like Level1 and Lawrence Tech. You just need to get more eyes on this; particularly smaller teams (startups, small companies, etc.)
Your freemium approach is appropriate for a product like this (
except maybe put a limit on the number of secrets in the free tier), but I would NOT recommend targeting medium/large/enterprise customers at this stage of your company (
unless you land sizable funding). While your product might be rock-solid & fantastic, larger companies are much more risk averse, so they tend to only want stable/established vendors, and rarely give the time of day to a solopreneur. Get established before moving up market.
Keep at it. For now, you'll have to split your time between product & marketing (
you really can't/shouldn't ignore/put-off marketing until you find someone). In a way, this is a good b/c you really should know all aspects of running your business before you delegate. It'll certainly be a rough go alone, but very much doable. Get good at time management; and just keep chipping away. Best wishes.