Electric saws and equipment is the future, your young enough to not be stuck in your ways like most old guys are, I would try to figure out how to repair broken electric stuff as well, maybe even dedicate more energy twords that for the long run
There certainly isn't much expertise at repairing electric chainsaws running around on the market.
I'll tell you where some money can be made: disassembling all those run-down, useless old batteries and re-soldering new ones back into the old electronics. This is a great way to defeat all the planned obsolescence put in by the manufacturers. This is particularly true for older models that have simply discontinued the old batteries, but your device works great.
Some of the batteries come with recycle counters that will execute a "kill" on the batteries after a certain number of charge cycles. Resetting that counter or bypassing it can be rather digitally tricky. There isn't much of a market for it, either, as the device is usually not expensive enough to justify a high-tech solution for an easily replaced tool.
You could probably make a killing on restoring Milwaukee, Ridgid, and Ryobi, and there is perhaps a solid revenue stream for restoring DJI drone batteries. First, you need to find a good source of reliable lithium batteries. There area LOT of Chinese brands that promise the sky on their milliamp ratings, but those lies are for gullible chumps that are looking for a cheap solution but lack the wisdom to know that you get what you pay for.
Sometimes.
There are people that do it:
https://www.sevarg.net/2018/09/02/tool-battery-teardowns-craftsman-192v/
I pretty much threw away my Ridgid multi-tool that used this little 12v battery pack. They just didn't last, and Ridgid wanted stupid amounts of money for the replacements.