This probably doesn’t make sense at your particular scale, but colo space can be surprisingly inexpensive, and it’s kind of fun at least until you get bored. In my local not-particularly-cheap market, a full rack with 120V/20A, 1Gbps Internet, and more cooling than you probably need costs about $400/mo. There is no particular requirement to put rack mount servers in it, although something with remote management capability is probably a good idea.
You can fit a lot of storage in there, and while you won’t get AWS-level availability or durability, the price, latency and IOPS will blow AWS out if the water, as long as you're using those IOPS and bandwidth within the same facility. Similarly, you can fit quite a bit of compute, but you’ll start needing to pay for more power if you need more than a couple servers worth.
You can fit a lot of storage in there, and while you won’t get AWS-level availability or durability, the price, latency and IOPS will blow AWS out if the water, as long as you're using those IOPS and bandwidth within the same facility. Similarly, you can fit quite a bit of compute, but you’ll start needing to pay for more power if you need more than a couple servers worth.
At your scale, Hetzner is probably a better idea.