Hi there,
Looks good case wise, The rest NOT so Much 
, all those long wires and bare ones twisted together is that a resistor ? flying over ? 
That’s not gonna FLY with any kind of of solid repeatability or reliability. IMO. humbly 
Firstly, Look at this info and compare the seeed schematic of the Xiao from the wiki, and does most of it to the letter, Except…
“ESP32-C3 is transmitting signals, there may be a sudden increase in the current draw, causing power rail collapse. Therefore, it is highly recommended to add a 10 μF capacitor to the power rail, which can work in conjunction with the 0.1 μF capacitor(s).”
From the data sheet , Look through the Check list and consider some changes. Schematic Checklist - ESP32-C3 - — ESP Hardware Design Guidelines latest documentation
You don’t have to do it all, But consider with your prototype there, Route all the connections UNDER the XIAO , Having the resistor and wires over the can is asking for signal issues among other things too.
A nice PCB would fit great with all the stuff with the Battery.
So as to your expectations…
What size is the Battery? Did you use the battery profiler from DigiKey? to ball park your requirements. It’s so easy a third grader can do it. How much current does the Apparatus draw while powered ON and doing its’ main functions. ?
I’d forget all the other capacitors and crap, just stick to the basic’s and get that working and documented as the baseline power wise. Start there.
You don’t need that big A$$ cap either. 25vdc working … WHAT ?? 
C’mon man, looks like you were trying EVERYTHING… 
HTH
GL 
PJ 
LMK.
Also the DS18B20 doesn’t look like it’s mounted properly UP next to the case like that. There’s a minimum air flow requirement.
Are you using parasitic power? You have a schematic?
Can you verify when you don’t get a check- in You DO get a TEMP reading? Also You are aware the C3 is not the best sleeper in the Xiao Line-up even among its ESP 32 brethren’ So. (It’s cheap though)